Synthesis and redetermination of the crystal structure of salicyl-aldehyde N(4)-morpholino-thio-semi-carbazone.

The structure of the title compound (systematic name: N-{[(2-hy-droxy-phen-yl)methyl-idene]amino}-morpholine-4-carbo-thio-amide), C12H15N3O2S, was prev-iously determined (Koo et al., 1977 ▸) using multiple-film equi-inclination Weissenberg data, but has been redetermined with higher precision to explore its conformation and the hydrogen-bonding patterns and supra-molecular inter-actions. The mol-ecular structure shows intra-molecular O-H⋯N and C-H⋯S inter-actions. The configuration of the C=N bond is E. The mol-ecule is slightly twisted about the central N-N bond. The best planes through the phenyl ring and the morpholino ring make an angle of 43.44 (17)°. In the crystal, the mol-ecules are connected into chains by N-H⋯O and C-H⋯O hydrogen bonds, which combine to generate sheets lying parallel to (002). The most prominent contribution to the surface contacts are H⋯H contacts (51.6%), as concluded from a Hirshfeld surface analysis.

Chemical context

For many years, scientific studies on cancer have attracted a lot of attention, especially in the field of anti­tumor drugs. Cisplatin is well known as an effective therapy to prohibit the proliferation of tumor cells (Berners-Price, 2011 ▸). However, this drug has some unforeseen side effects with detrimental effects on the patient’s health (Lévi et al., 2000 ▸; Go & Adjei, 1999 ▸; Harbour et al., 1996 ▸). In a search for anti­tumour drugs with fewer harmful side effects, thio­semicarbazides were examined since this organic class of thio­urea derivatives was known to possess a diversity of biological activities such as anti­tumoral, anti­bacterial, and anti­fungal activities owing to presence of the N—N—C=S system (Dilović et al., 2008 ▸; Liberta & West, 1992 ▸). Many mechanisms have been advanced to probe the role of this conjugated system. In general, thio­semicarbazones can bind to nucleotides of tumour cells by the nitro­gen and sulfur atoms, which prevents the distorted DNA from translation and encryption for their growth (Dilović et al., 2008 ▸).

Thio­semicarbazones are synthesized by the condensation between an aldehyde or ketone and an N(4)-substituted thio­semicarbazide. Many reports have demonstrated that N(4)-aromatic or heterocyclic substituted thio­semicarbazides are biologically more active than thio­semicarbazones without substituted groups (Dilović et al., 2008 ▸; Chen et al., 2004 ▸; Shi et al., 2009 ▸). In addition, salicyl­aldehyde is a key compound in the synthesis of a variety of potential therapeutic products (Bindu et al., 1998 ▸).

The crystal and mol­ecular structure of salicyl­aldehyde N(4)-morpholino­thio­semicarbazone was published previously (Koo et al., 1977 ▸) based on multiple-film equi-inclination Weissenberg data using Cu Kα radiation and refined to an R value of 0.11. In this study, we present the synthesis of salicyl­aldehyde N(4)-morpholino­thio­semicarbazone (3) together with its structural characteristics and crystal structure redetermination using present-day technology.

Structural commentary

The title compound crystallizes in the ortho­rhom­bic space group Pna21 with one mol­ecule in the asymmetric unit (Fig. 1 ▸). The N9—N10 and C11=N10 bond lengths are 1.371 (3) and 1.275 (3) Å, respectively (compared to 1.40 and 1.30 Å in the previous structure determination; Koo et al., 1977 ▸). The configuration of the C11=N10 bond is E [the N9—N10—C11—C12 torsion angle is −179.9 (3)°], which gives rise to an intra­molecular O18—H18⋯N10 hydrogen bond with an (6) graph-set motif (Table 1 ▸). The planes of the phenyl ring (r.m.s. deviation = 0.0020 Å) and the thio­semicarbazone function (N1/C7–C11; r.m.s. deviation = 0.0911 Å) make an angle of 16.26 (5)°. The mol­ecule is slightly twisted about the N9—N10 bond [torsion angle C7—N9—N10—C11 is 162.4 (3)°; +ap conformation].

Figure 1

A view of the mol­ecular structure of (3), with atom labels and displacement ellipsoids drawn at the 50% probability level. H atoms are shown as small circles of arbitrary radii and the intra­molecular O—H⋯N and C—H⋯S inter­actions, respectively, by blue and grey dashed lines.

Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N9—H9⋯O4i	0.86 (3)	2.33 (3)	3.141 (3)	157 (3)
O18—H18⋯N10	0.80 (4)	1.91 (5)	2.597 (3)	145 (4)
C6—H6A⋯S8	0.97	2.62	3.121 (3)	112
C15—H15⋯O18ii	0.93	2.48	3.404 (4)	176

Symmetry codes: (i) ; (ii) .

The morpholino ring adopts a chair conformation [puckering parameters Q = 0.554 (3) Å, θ = 173.2 (3)° and φ = 214 (3)°] with the thio­semicarbazone function in an equatorial position. The plane of the phenyl ring forms a dihedral angle of 43.44 (17)° with the best plane through the morpholino ring. A second intra­molecular C6—H6A⋯S8 inter­action is observed (Table 1 ▸).

Supra­molecular features

The crystal packing of (3) is dominated by N9—H9⋯O4 hydrogen bonds (Table 1 ▸), resulting in the formation of chains of mol­ecules with graph-set motif (7) propagating along the a-axis direction (Fig. 2 ▸). Furthermore, a second parallel chain of mol­ecules with graph-set motif (5) running along the a-axis direction is formed by C15—H15⋯O18 inter­actions (Fig. 3 ▸). These two chain motifs combine to generate a sheet lying parallel to (002). No voids or π–π stackings are observed in the crystal packing of (3).

Figure 2

Partial crystal packing of (3), showing the N—H⋯O inter­actions (red dashed lines) resulting in chain formation in the a-axis direction [see Table 1 ▸; symmetry code: (i) x + , −y + , z].

Figure 3

Partial crystal packing of (3), showing the C—H⋯O inter­actions (red dashed lines) resulting in chain formation in the a-direction [see Table 1 ▸; symmetry code: (ii) x + , −y + , z].

A Hirshfeld surface analysis (Spackman & Jayatilaka, 2009 ▸) and the associated two-dimensional fingerprint plots (McKinnon et al., 2007 ▸) were performed in order to further investigate the supra­molecular network. The Hirshfeld surface calculated using CrystalExplorer (Turner et al., 2017 ▸) and mapped over d norm is given in Fig. 4 ▸. The bright-red spots near atoms O4 and N9 in Fig. 4 ▸ a refer to the N9—H9⋯O4 hydrogen bond, and near atoms C15 and O18 in Fig. 4 ▸ b to the C15—H15⋯O18 hydrogen bond. The faint-red spots near atoms C5 and S8 illustrate a short contact in the crystal packing of (3) (H5B⋯S8 = 2.913 Å). The fingerprint plots (Fig. 5 ▸) further indicate a major contribution by H⋯H contacts, corresponding to 51.6% of the two-dimensional fingerprint plot (Fig. 5 ▸ b). Significant contributions by reciprocal O⋯H/H⋯O (13.4%) and S⋯H/H⋯S (12.5%) contacts appear as two symmetrical spikes at d e + d i ≃ 2.2 and 2.8 Å, respectively (Fig. 5 ▸ c,d). Smaller contributions are from C⋯H/H⋯C (11.7%, Fig. 5 ▸ e), N⋯C/C⋯N (5.3%, Fig. 5 ▸ f), C⋯C (3.2%), N⋯H/H⋯N (1.6%), C⋯O/O⋯C (0.3%), C⋯S/S⋯C (0.3%) and O⋯O contacts (0.1%).

Figure 4

The Hirshfeld surface mapped over d norm for (3) in the range −0.3153 to 1.2662 a.u.

Figure 5

Full two-dimensional fingerprint plots for (3), showing (a) all inter­actions, and delineated into (b) H⋯H, (c) O⋯H/H⋯O, (d) S⋯H/H⋯S, (e) C⋯H/H⋯C and (f) N⋯C/C⋯N inter­actions. The d i and d e values are the closest inter­nal and external distances (in Å) from a given point on the Hirshfeld surface.

Database survey

A search of the Cambridge Structural Database (CSD, Version 5.40, update of May 2019; Groom et al., 2016 ▸) for the central N—C(=S)—NH—N=C moiety (Fig. 6 ▸ a) present in the title compound gave 583 hits. Fig. 6 ▸ b,c illustrate the histograms of the distribution of torsion angles τ1 and τ2. The histogram of τ1 shows a major preference for the −sp/+sp (or cis) conformation and a minor preference for the −ap/+ap (or trans) conformation. For torsion angle τ2, only one region is preferred: a narrow spread in the region −ap/+ap (or trans). For (3), the torsion angles τ1 and τ2 are both in the +ap region [τ1 = 173.8 (3) and τ2 = 162.4 (3)°].

Figure 6

(a) Fragment used for a search in the CSD. (b),(c) Histograms of torsion angles τ1 and τ2. The vertical pink lines show the torsion angle observed in (3).

The most similar compound present in the CSD is the 2-hy­droxy­naphthaldehyde-based thio­semicarbazone (refcode IDEQAM; Aneesrahman et al., 2018 ▸). The asymmetric unit contains two mol­ecules (one morpholino ring shows disorder). The mean plane of the non-disordered morpholino ring makes an angle of 36.9 (7)° with the naphthalene ring system. The torsion angles τ1 [175.89 (15) and −175.97 (15)°] and τ2 [166.51 (16) and −174.99 (16)°] are similar to those observed for the title compound. An intra­molecular hydrogen bond similar to O18—H18⋯N10 is also observed.

Synthesis and crystallization

The reaction scheme for the synthesis of (3) is given in Fig. 7 ▸.

Figure 7

Reaction scheme for the synthesis of (3).

:

A mixture consisting of carbon di­sulfide (0.2 mol) and concentrated ammonia (25 mL) was stirred to form a homogeneous solution at 278 K. Then, morpholine (0.2 mol) was added dropwise to this solution. The yellow solid that separated from the solution was filtered off and immediately dissolved in deionized water (300 mL) at room temperature to generate a yellow solution. Sodium chloro­acetate (0.2 mol) was added to this solution and the reaction mixture maintained for 6 h at room temperature. The yellowish solution was acidified with concentrated hydro­chloric acid and the resulting white precipitate was filtered off and recrystallized from ethanol.

:

A mixture composed of (1) (50 mmol), deionized water (10 mL) and hydrazine hydrate (25 mL) was refluxed for 30 minutes at 353 K. The white solid which precipitated from the transparent solution was filtered off and recrystallized from ethanol to give (2).

:

After dissolving (2) in hot ethanol, the solution was added to an equivalent amount of salicyl­aldehyde. The final solution was refluxed at 353 K for 2 h in the presence of acetic acid as a catalyst. The resulting solution was gradually reduced in volume at room temperature overnight. The needle-shaped crystals that formed were filtered off and recrystallized from ethanol to give (3) in the form of transparent crystals (yield 60%), m.p. 461–463 K. FT–IR (cm−1): 3436 (O—H), 3279 (N—H), 1617 (CAr—H), 1540 (C=N), 1061 (N—N), 1348 and 959 (C=S). 1H NMR [Bruker 500 MHz, d-DMSO, δ (ppm), J (Hz)]: 3.67 (4H, t, H2 and H6); 3.92 (4H, t, H3 and H5); 6.90 (2H, m, H14 and H16); 7.28 (1H, m, J = 7.5, H15); 7.41 (1H, d, J = 7.0, H17); 8.47 (1H, s, H11); 11.49 (1H, br, N—H); 11.55 (1H, br, O—H). 13C NMR [Bruker 125 MHz, d-DMSO, δ (ppm)]: 49.4 (C2 and C6), 66.2 (C3 and C5), 117.0 (C14), 118.9 (C12), 119.5 (C16), 130.4 (C17), 131.3 (C15), 146.9 (C13), 157.6 (C11), 180.1 (C7). UV–Vis (ethanol, nm): 200 (π→π*); 300 and 350 (n→π*).

Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2 ▸. Both H atoms H9 and H18 were located from difference electron density maps and refined freely. The other H atoms were placed in idealized positions and included as riding contributions with U iso(H) values 1.2U eq of the parent atoms, with C—H distances of 0.93 (aromatic, CH=N) and 0.97 Å (CH2). In the final cycles of refinement, 4 outliers were omitted.

Table 2

Experimental details

Crystal data
Chemical formula	C12H15N3O2S
M r	265.33
Crystal system, space group	Orthorhombic, P n a21
Temperature (K)	293
a, b, c (Å)	11.7579 (4), 15.0584 (5), 7.1103 (3)
V (Å3)	1258.92 (8)
Z	4
Radiation type	Mo Kα
μ (mm−1)	0.26
Crystal size (mm)	0.5 × 0.2 × 0.1
Data collection
Diffractometer	Rigaku Oxford Diffraction SuperNova, Single source at offset/far, Eos
Absorption correction	Multi-scan (CrysAlis PRO; Rigaku OD, 2018 ▸)
T min, T max	0.483, 1.000
No. of measured, independent and observed [I > 2σ(I)] reflections	12278, 2565, 2314
R int	0.025
(sin θ/λ)max (Å−1)	0.625
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S	0.034, 0.087, 1.07
No. of reflections	2565
No. of parameters	171
No. of restraints	1
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement
Δρmax, Δρmin (e Å−3)	0.17, −0.17
Absolute structure	Flack x determined using 938 quotients [(I +)−(I −)]/[(I +)+(I −)] (Parsons et al., 2013 ▸)
Absolute structure parameter	0.02 (3)

Computer programs: CrysAlis PRO (Rigaku OD, 2018 ▸), SHELXT (Sheldrick, 2015a ▸), SHELXL (Sheldrick, 2015b ▸) and OLEX2 (Dolomanov et al., 2009 ▸).

Crystal structure: contains datablock(s) I. DOI: 10.1107/S2056989019011812/mw2147sup1.cif

Structure factors: contains datablock(s) I. DOI: 10.1107/S2056989019011812/mw2147Isup2.hkl

Click here for additional data file.

Supporting information file. DOI: 10.1107/S2056989019011812/mw2147Isup3.cml

CCDC reference: 1949697

Additional supporting information: crystallographic information; 3D view; checkCIF report

C12H15N3O2S	Dx = 1.400 Mg m−3
Mr = 265.33	Mo Kα radiation, λ = 0.71073 Å
Orthorhombic, Pna21	Cell parameters from 5842 reflections
a = 11.7579 (4) Å	θ = 3.2–27.3°
b = 15.0584 (5) Å	µ = 0.26 mm−1
c = 7.1103 (3) Å	T = 293 K
V = 1258.92 (8) Å3	Block, colourless
Z = 4	0.5 × 0.2 × 0.1 mm
F(000) = 560

Rigaku Oxford Diffraction SuperNova, Single source at offset/far, Eos diffractometer	2565 independent reflections
Radiation source: micro-focus sealed X-ray tube, SuperNova (Mo) X-ray Source	2314 reflections with I > 2σ(I)
Mirror monochromator	Rint = 0.025
Detector resolution: 15.9631 pixels mm-1	θmax = 26.4°, θmin = 2.7°
ω scans	h = −14→14
Absorption correction: multi-scan (CrysAlisPro; Rigaku OD, 2018)	k = −18→18
Tmin = 0.483, Tmax = 1.000	l = −8→8
12278 measured reflections

Refinement on F2	Secondary atom site location: difference Fourier map
Least-squares matrix: full	Hydrogen site location: mixed
R[F2 > 2σ(F2)] = 0.034	H atoms treated by a mixture of independent and constrained refinement
wR(F2) = 0.087	w = 1/[σ2(Fo2) + (0.0434P)2 + 0.1653P] where P = (Fo2 + 2Fc2)/3
S = 1.07	(Δ/σ)max < 0.001
2565 reflections	Δρmax = 0.17 e Å−3
171 parameters	Δρmin = −0.17 e Å−3
1 restraint	Absolute structure: Flack x determined using 938 quotients [(I+)-(I-)]/[(I+)+(I-)] (Parsons et al., 2013)
Primary atom site location: dual space	Absolute structure parameter: 0.02 (3)

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.

	x	y	z	Uiso*/Ueq
N1	0.12956 (17)	0.37994 (13)	0.5311 (5)	0.0441 (5)
C2	0.1602 (2)	0.28850 (18)	0.4815 (5)	0.0438 (7)
H2A	0.174911	0.254390	0.594672	0.053*
H2B	0.228621	0.288274	0.405192	0.053*
C3	0.0625 (3)	0.2474 (2)	0.3728 (5)	0.0552 (8)
H3A	0.050961	0.280351	0.257136	0.066*
H3B	0.081833	0.186795	0.339747	0.066*
O4	−0.04027 (17)	0.24774 (14)	0.4794 (3)	0.0545 (6)
C5	−0.0710 (2)	0.3379 (2)	0.5178 (7)	0.0615 (9)
H5A	−0.141436	0.338728	0.588879	0.074*
H5B	−0.084419	0.368531	0.399814	0.074*
C6	0.0177 (3)	0.3860 (2)	0.6249 (6)	0.0597 (9)
H6A	−0.003873	0.447934	0.636901	0.072*
H6B	0.023218	0.361089	0.750398	0.072*
C7	0.2028 (2)	0.44909 (15)	0.5299 (5)	0.0388 (6)
S8	0.16206 (6)	0.55578 (4)	0.54532 (17)	0.0552 (2)
N9	0.31482 (18)	0.42656 (14)	0.5168 (4)	0.0406 (6)
H9	0.337 (2)	0.3724 (19)	0.521 (6)	0.044 (8)*
N10	0.39379 (18)	0.49289 (14)	0.4965 (3)	0.0384 (6)
C11	0.4978 (2)	0.47549 (15)	0.5317 (5)	0.0366 (5)
H11	0.519030	0.418814	0.569994	0.044*
C12	0.5829 (2)	0.54502 (15)	0.5115 (4)	0.0353 (6)
C13	0.5532 (2)	0.63316 (17)	0.4666 (4)	0.0394 (6)
C14	0.6374 (3)	0.69733 (19)	0.4546 (5)	0.0512 (8)
H14	0.617815	0.755628	0.426000	0.061*
C15	0.7497 (3)	0.6758 (2)	0.4845 (4)	0.0542 (8)
H15	0.805097	0.719608	0.475521	0.065*
C16	0.7811 (2)	0.5896 (2)	0.5277 (6)	0.0537 (7)
H16	0.857037	0.575138	0.547403	0.064*
C17	0.6977 (2)	0.52566 (18)	0.5408 (6)	0.0466 (6)
H17	0.718495	0.467720	0.570242	0.056*
O18	0.44378 (18)	0.65822 (14)	0.4336 (4)	0.0513 (6)
H18	0.402 (3)	0.617 (3)	0.446 (6)	0.073 (13)*

	U11	U22	U33	U12	U13	U23
N1	0.0326 (10)	0.0409 (10)	0.0590 (14)	−0.0031 (9)	0.0038 (14)	−0.0046 (15)
C2	0.0354 (13)	0.0407 (13)	0.0551 (19)	−0.0024 (11)	0.0056 (13)	−0.0046 (13)
C3	0.0576 (18)	0.0553 (18)	0.0528 (19)	−0.0181 (15)	0.0075 (16)	−0.0038 (15)
O4	0.0436 (11)	0.0530 (11)	0.0670 (16)	−0.0148 (9)	0.0020 (11)	0.0020 (11)
C5	0.0376 (14)	0.0584 (17)	0.088 (3)	−0.0044 (13)	−0.0064 (19)	0.014 (2)
C6	0.0370 (16)	0.0545 (17)	0.088 (3)	−0.0016 (14)	0.0139 (17)	−0.0090 (18)
C7	0.0360 (12)	0.0418 (12)	0.0387 (14)	−0.0009 (10)	−0.0011 (15)	0.0015 (15)
S8	0.0481 (4)	0.0396 (3)	0.0780 (6)	0.0056 (3)	0.0010 (5)	−0.0010 (5)
N9	0.0333 (11)	0.0329 (10)	0.0556 (16)	−0.0031 (8)	0.0009 (12)	0.0040 (12)
N10	0.0336 (11)	0.0359 (10)	0.0458 (15)	−0.0050 (9)	−0.0004 (10)	0.0032 (10)
C11	0.0388 (13)	0.0329 (10)	0.0380 (13)	−0.0003 (9)	−0.0010 (14)	0.0021 (14)
C12	0.0353 (12)	0.0354 (11)	0.0353 (16)	−0.0029 (9)	0.0002 (12)	−0.0007 (12)
C13	0.0418 (14)	0.0356 (12)	0.0408 (15)	0.0001 (11)	0.0026 (12)	−0.0019 (12)
C14	0.0605 (19)	0.0351 (13)	0.0581 (19)	−0.0111 (13)	0.0005 (16)	0.0001 (14)
C15	0.0534 (17)	0.0585 (17)	0.0507 (19)	−0.0249 (15)	−0.0003 (15)	−0.0007 (15)
C16	0.0363 (14)	0.0681 (17)	0.0567 (18)	−0.0104 (13)	−0.0022 (17)	0.0016 (19)
C17	0.0389 (14)	0.0465 (13)	0.0545 (16)	−0.0001 (11)	−0.0039 (18)	0.0019 (18)
O18	0.0448 (11)	0.0349 (10)	0.0744 (15)	0.0042 (9)	−0.0019 (11)	0.0049 (10)

N1—C2	1.466 (3)	N9—H9	0.86 (3)
N1—C6	1.478 (4)	N9—N10	1.371 (3)
N1—C7	1.351 (3)	N10—C11	1.275 (3)
C2—H2A	0.9700	C11—H11	0.9300
C2—H2B	0.9700	C11—C12	1.456 (3)
C2—C3	1.516 (4)	C12—C13	1.409 (3)
C3—H3A	0.9700	C12—C17	1.396 (4)
C3—H3B	0.9700	C13—C14	1.386 (4)
C3—O4	1.426 (3)	C13—O18	1.361 (3)
O4—C5	1.432 (4)	C14—H14	0.9300
C5—H5A	0.9700	C14—C15	1.376 (4)
C5—H5B	0.9700	C15—H15	0.9300
C5—C6	1.481 (5)	C15—C16	1.383 (4)
C6—H6A	0.9700	C16—H16	0.9300
C6—H6B	0.9700	C16—C17	1.377 (4)
C7—S8	1.680 (2)	C17—H17	0.9300
C7—N9	1.364 (3)	O18—H18	0.80 (4)
C2—N1—C6	112.7 (2)	N1—C7—N9	115.1 (2)
C7—N1—C2	124.4 (2)	N9—C7—S8	121.17 (18)
C7—N1—C6	121.5 (2)	C7—N9—H9	121.8 (18)
N1—C2—H2A	110.0	C7—N9—N10	118.7 (2)
N1—C2—H2B	110.0	N10—N9—H9	119.5 (18)
N1—C2—C3	108.6 (2)	C11—N10—N9	118.6 (2)
H2A—C2—H2B	108.4	N10—C11—H11	120.3
C3—C2—H2A	110.0	N10—C11—C12	119.5 (2)
C3—C2—H2B	110.0	C12—C11—H11	120.3
C2—C3—H3A	109.3	C13—C12—C11	121.9 (2)
C2—C3—H3B	109.3	C17—C12—C11	120.0 (2)
H3A—C3—H3B	107.9	C17—C12—C13	118.1 (2)
O4—C3—C2	111.7 (3)	C14—C13—C12	119.5 (3)
O4—C3—H3A	109.3	O18—C13—C12	122.3 (2)
O4—C3—H3B	109.3	O18—C13—C14	118.1 (3)
C3—O4—C5	108.6 (2)	C13—C14—H14	119.6
O4—C5—H5A	109.1	C15—C14—C13	120.7 (3)
O4—C5—H5B	109.1	C15—C14—H14	119.6
O4—C5—C6	112.6 (2)	C14—C15—H15	119.6
H5A—C5—H5B	107.8	C14—C15—C16	120.8 (3)
C6—C5—H5A	109.1	C16—C15—H15	119.6
C6—C5—H5B	109.1	C15—C16—H16	120.6
N1—C6—C5	111.4 (3)	C17—C16—C15	118.7 (3)
N1—C6—H6A	109.4	C17—C16—H16	120.6
N1—C6—H6B	109.4	C12—C17—H17	118.9
C5—C6—H6A	109.4	C16—C17—C12	122.1 (3)
C5—C6—H6B	109.4	C16—C17—H17	118.9
H6A—C6—H6B	108.0	C13—O18—H18	110 (3)
N1—C7—S8	123.73 (19)
N1—C2—C3—O4	−58.7 (4)	N9—N10—C11—C12	−179.9 (3)
N1—C7—N9—N10	173.8 (3)	N10—C11—C12—C13	4.5 (5)
C2—N1—C6—C5	−50.2 (4)	N10—C11—C12—C17	−176.9 (3)
C2—N1—C7—S8	167.6 (3)	C11—C12—C13—C14	178.1 (3)
C2—N1—C7—N9	−13.0 (5)	C11—C12—C13—O18	−2.1 (4)
C2—C3—O4—C5	62.2 (4)	C11—C12—C17—C16	−178.5 (4)
C3—O4—C5—C6	−59.5 (4)	C12—C13—C14—C15	0.6 (5)
O4—C5—C6—N1	53.7 (4)	C13—C12—C17—C16	0.2 (5)
C6—N1—C2—C3	51.7 (4)	C13—C14—C15—C16	−0.2 (5)
C6—N1—C7—S8	−27.0 (5)	C14—C15—C16—C17	−0.2 (5)
C6—N1—C7—N9	152.5 (3)	C15—C16—C17—C12	0.2 (6)
C7—N1—C2—C3	−141.7 (3)	C17—C12—C13—C14	−0.6 (4)
C7—N1—C6—C5	142.7 (3)	C17—C12—C13—O18	179.3 (3)
C7—N9—N10—C11	162.4 (3)	O18—C13—C14—C15	−179.3 (3)
S8—C7—N9—N10	−6.7 (4)

D—H···A	D—H	H···A	D···A	D—H···A
N9—H9···O4i	0.86 (3)	2.33 (3)	3.141 (3)	157 (3)
O18—H18···N10	0.80 (4)	1.91 (5)	2.597 (3)	145 (4)
C6—H6A···S8	0.97	2.62	3.121 (3)	112
C15—H15···O18ii	0.93	2.48	3.404 (4)	176