Literature DB >> 21200930

l-Nebiviololinium chloride dihydrate.

Gisbert Tuchalski, Andre Hänsicke, Günther Reck, Franziska Emmerling.   

Abstract

The hydro-chloride salt of chiral l-nebivolol {systematic name: (+)-(R,S,S,S)-bis-[2-(6-fluoro-3,4-dihydro-2H-1-benzopyran-2-yl)-2-hydroxy-ethyl]ammonium chloride dihydrate}, C(22)H(26)F(2)NO(4) (+)·Cl(-)·2H(2)O, was obtained by chiral liquid chromatography as a dihydrate. The pyran rings adopt half-chair conformations. Hydrogen bonds between the cation, anions and water mol-ecules contribute to the formation of layers parallel to the ac plane.

Entities:  

Year:  2007        PMID: 21200930      PMCID: PMC2915012          DOI: 10.1107/S1600536807061831

Source DB:  PubMed          Journal:  Acta Crystallogr Sect E Struct Rep Online        ISSN: 1600-5368


Related literature

For related literature, see: Cini et al. (1990 ▶); van Lommen et al. (1990 ▶); Peeters et al. (1993 ▶); Tuchalski et al. (2006 ▶).

Experimental

Crystal data

C22H26F2NO4 +·Cl−·2H2O M = 477.92 Orthorhombic, a = 4.8026 (4) Å b = 14.5781 (12) Å c = 33.261 (3) Å V = 2328.7 (3) Å3 Z = 4 Mo Kα radiation μ = 0.22 mm−1 T = 291 (2) K 0.60 × 0.12 × 0.09 mm

Data collection

Bruker SMART APEX CCD area-detector diffractometer Absorption correction: multi-scan (SADABS; Bruker, 2001 ▶) T min = 0.865, T max = 0.981 26222 measured reflections 3401 independent reflections 2857 reflections with I > 2σ(I) R int = 0.054

Refinement

R[F 2 > 2σ(F 2)] = 0.041 wR(F 2) = 0.113 S = 1.05 3401 reflections 301 parameters 6 restraints H atoms treated by a mixture of independent and constrained refinement Δρmax = 0.33 e Å−3 Δρmin = −0.24 e Å−3 Absolute structure: Flack (1983 ▶), 608 Friedel pairs Flack parameter: −0.04 (12) Data collection: SMART (Bruker, 2001 ▶); cell refinement: SAINT (Bruker, 2001 ▶); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 1997 ▶); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997 ▶); molecular graphics: ORTEPIII (Burnett & Johnson, 1996 ▶); software used to prepare material for publication: SHELXTL (Bruker, 2001 ▶). Crystal structure: contains datablocks I, global. DOI: 10.1107/S1600536807061831/hb2656sup1.cif Structure factors: contains datablocks I. DOI: 10.1107/S1600536807061831/hb2656Isup2.hkl Additional supplementary materials: crystallographic information; 3D view; checkCIF report
C22H26F2NO4+·Cl·2H2OF000 = 1008
Mr = 477.92Dx = 1.363 Mg m3
Orthorhombic, P212121Mo Kα radiation λ = 0.71069 Å
Hall symbol: P 2ac 2abCell parameters from 120 reflections
a = 4.8026 (4) Åθ = 1.2–25.4º
b = 14.5781 (12) ŵ = 0.22 mm1
c = 33.261 (3) ÅT = 291 (2) K
V = 2328.7 (3) Å3Needle, colourless
Z = 40.60 × 0.12 × 0.09 mm
APEX CCD area-detector diffractometer3401 independent reflections
Radiation source: fine-focus sealed tube2857 reflections with I > 2σ(I)
Monochromator: graphiteRint = 0.054
T = 292(2) Kθmax = 26.4º
ω–scanθmin = 1.2º
Absorption correction: multi-scan(SADABS; Bruker, 2001)h = −6→6
Tmin = 0.865, Tmax = 0.981k = −18→18
26222 measured reflectionsl = −41→41
Refinement on F2Hydrogen site location: inferred from neighbouring sites
Least-squares matrix: fullH atoms treated by a mixture of independent and constrained refinement
R[F2 > 2σ(F2)] = 0.041  w = 1/[σ2(Fo2) + (0.0545P)2 + 0.978P] where P = (Fo2 + 2Fc2)/3
wR(F2) = 0.113(Δ/σ)max = 0.004
S = 1.05Δρmax = 0.33 e Å3
3401 reflectionsΔρmin = −0.24 e Å3
301 parametersExtinction correction: none
6 restraintsAbsolute structure: Flack (1983), xx Friedel pairs
Primary atom site location: structure-invariant direct methodsFlack parameter: −0.04 (12)
Secondary atom site location: difference Fourier map
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes.
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger.
xyzUiso*/Ueq
Cl10.7060 (2)0.96561 (9)0.28493 (3)0.0826 (4)
O1W0.2063 (8)1.0846 (2)0.24528 (8)0.0899 (10)
H1A0.348 (7)0.866 (3)0.2722 (19)0.135*
H1B0.348 (8)1.075 (3)0.2618 (13)0.135*
O2W0.2154 (7)0.8243 (2)0.26894 (9)0.0772 (8)
H2A0.064 (6)0.858 (3)0.2719 (18)0.116*
H2B0.191 (10)1.0312 (17)0.2332 (13)0.116*
N10.7326 (6)0.57169 (17)0.33807 (7)0.0461 (7)
H10.84750.56220.31710.069*
H20.58290.60260.32900.069*
C2'0.8776 (7)0.6276 (2)0.36873 (9)0.0435 (8)
H31.02880.59180.38000.052*
H40.74840.64140.39030.052*
C20.6415 (7)0.4814 (2)0.35470 (9)0.0397 (8)
H50.51960.49200.37750.048*
H60.80350.44830.36430.048*
C30.4905 (7)0.4230 (2)0.32411 (9)0.0390 (8)
H70.61690.40920.30180.058*
C3'0.9940 (7)0.7165 (2)0.35241 (9)0.0403 (8)
H80.84980.74780.33670.048*
O40.2600 (5)0.47447 (14)0.30934 (6)0.0449 (5)
H90.17440.44370.29280.067*
O4'1.2211 (5)0.69428 (15)0.32678 (6)0.0508 (6)
H101.28710.74150.31740.076*
C50.3984 (7)0.3337 (2)0.34381 (9)0.0403 (8)
H110.56450.30080.35300.060*
C5'1.0904 (7)0.7793 (2)0.38644 (9)0.0390 (8)
H121.25510.75210.39910.047*
O60.2381 (5)0.36036 (13)0.37856 (6)0.0455 (6)
O6'0.8676 (5)0.78023 (15)0.41512 (6)0.0473 (6)
C70.0810 (7)0.2942 (2)0.39725 (9)0.0421 (8)
C7'0.8967 (7)0.8404 (2)0.44712 (9)0.0411 (8)
C80.0283 (7)0.2085 (2)0.37968 (11)0.0457 (9)
C8'1.0804 (7)0.9139 (2)0.44601 (10)0.0431 (8)
C90.1485 (8)0.1844 (2)0.33954 (11)0.0571 (10)
H130.01170.15080.32390.069*
H140.30970.14520.34320.069*
C9'1.2565 (8)0.9325 (2)0.40927 (9)0.0461 (8)
H151.44950.91830.41520.055*
H161.24510.99710.40250.055*
C100.2340 (9)0.2710 (2)0.31677 (9)0.0506 (9)
H170.34600.25430.29360.061*
H180.06920.30260.30720.061*
C10'1.1607 (7)0.8755 (2)0.37343 (9)0.0455 (8)
H190.99820.90380.36140.055*
H201.30720.87360.35340.055*
C11−0.0325 (8)0.3188 (3)0.43371 (10)0.0527 (9)
H210.00970.37560.44490.063*
C11'0.7255 (8)0.8244 (2)0.47963 (9)0.0499 (9)
H220.60060.77570.47910.060*
C12−0.2092 (9)0.2592 (3)0.45375 (12)0.0668 (11)
H23−0.29080.27530.47810.080*
C12'0.7387 (9)0.8806 (3)0.51317 (10)0.0578 (10)
H240.62420.87070.53530.069*
C13−0.2590 (9)0.1757 (3)0.43632 (13)0.0660 (11)
C13'0.9266 (9)0.9516 (3)0.51263 (10)0.0581 (10)
C14−0.1492 (8)0.1495 (3)0.40030 (13)0.0615 (11)
H25−0.19280.09240.38950.092*
C14'1.0930 (8)0.9700 (3)0.48011 (10)0.0551 (9)
H261.21411.01980.48070.066*
F1−0.4347 (6)0.11636 (19)0.45634 (9)0.1020 (9)
F1'0.9452 (7)1.00610 (18)0.54589 (7)0.0957 (9)
U11U22U33U12U13U23
Cl10.0593 (7)0.1298 (10)0.0587 (6)−0.0099 (7)−0.0044 (5)0.0150 (6)
O1W0.098 (3)0.120 (3)0.0524 (17)0.013 (2)−0.0059 (17)−0.0197 (17)
O2W0.0740 (19)0.095 (2)0.0626 (16)−0.0110 (18)0.0067 (18)0.0175 (16)
N10.0506 (17)0.0464 (15)0.0414 (14)−0.0137 (15)0.0035 (14)−0.0038 (13)
C2'0.0459 (19)0.0432 (19)0.0414 (18)−0.0070 (16)−0.0018 (16)−0.0028 (15)
C20.0390 (18)0.0357 (17)0.0444 (17)−0.0061 (15)0.0004 (15)0.0030 (14)
C30.0357 (18)0.0401 (17)0.0411 (17)0.0007 (16)0.0039 (15)−0.0046 (15)
C3'0.0384 (18)0.0422 (18)0.0403 (17)−0.0039 (16)0.0044 (15)0.0003 (15)
O40.0432 (12)0.0465 (13)0.0450 (12)0.0013 (13)−0.0060 (12)−0.0019 (10)
O4'0.0512 (14)0.0442 (12)0.0569 (13)−0.0016 (12)0.0125 (13)−0.0022 (11)
C50.0404 (18)0.0349 (17)0.0456 (18)0.0003 (15)0.0008 (17)−0.0006 (15)
C5'0.0348 (17)0.0430 (19)0.0393 (17)−0.0010 (15)−0.0008 (15)0.0007 (15)
O60.0562 (14)0.0394 (12)0.0410 (11)−0.0112 (12)0.0060 (12)−0.0027 (10)
O6'0.0437 (13)0.0532 (14)0.0449 (12)−0.0116 (11)0.0076 (11)−0.0069 (11)
C70.0403 (18)0.044 (2)0.0424 (19)−0.0079 (17)−0.0072 (16)0.0112 (16)
C7'0.0400 (19)0.0469 (19)0.0365 (17)0.0051 (17)−0.0033 (16)−0.0046 (15)
C80.0412 (19)0.0370 (18)0.059 (2)−0.0038 (17)−0.0063 (17)0.0082 (17)
C8'0.0386 (19)0.0441 (19)0.0467 (19)0.0081 (17)−0.0071 (16)−0.0029 (16)
C90.060 (3)0.0351 (18)0.076 (3)−0.0089 (18)0.005 (2)−0.0075 (18)
C9'0.0445 (19)0.0416 (18)0.0522 (19)−0.0056 (18)−0.0005 (18)0.0015 (16)
C100.056 (2)0.046 (2)0.0500 (19)−0.008 (2)0.003 (2)−0.0102 (16)
C10'0.049 (2)0.0463 (19)0.0408 (18)−0.0076 (16)−0.0002 (16)0.0044 (15)
C110.058 (2)0.055 (2)0.045 (2)−0.012 (2)0.0019 (19)0.0034 (18)
C11'0.051 (2)0.055 (2)0.0446 (19)0.0013 (19)0.0068 (18)0.0017 (16)
C120.060 (3)0.078 (3)0.062 (2)−0.011 (2)0.007 (2)0.016 (2)
C12'0.058 (2)0.072 (2)0.0435 (19)0.016 (2)0.0081 (19)0.0023 (19)
C130.055 (2)0.060 (2)0.084 (3)−0.020 (2)0.001 (2)0.027 (2)
C13'0.068 (3)0.065 (3)0.041 (2)0.008 (2)−0.001 (2)−0.0143 (19)
C140.054 (2)0.048 (2)0.082 (3)−0.0118 (19)−0.008 (2)0.009 (2)
C14'0.059 (2)0.051 (2)0.056 (2)−0.002 (2)−0.007 (2)−0.0113 (18)
F10.090 (2)0.0920 (18)0.124 (2)−0.0404 (17)0.0217 (17)0.0312 (17)
F1'0.124 (2)0.1009 (19)0.0617 (14)−0.0078 (18)0.0089 (15)−0.0367 (14)
O1W—H1B0.89 (4)C7—C81.402 (5)
O1W—H2B0.88 (3)C7'—C11'1.378 (5)
O2W—H1A0.89 (4)C7'—C8'1.388 (5)
O2W—H2A0.92 (5)C8—C141.391 (5)
N1—C2'1.479 (4)C8—C91.496 (5)
N1—C21.493 (4)C8'—C14'1.400 (5)
N1—H10.9000C8'—C9'1.511 (5)
N1—H20.9000C9—C101.528 (5)
C2'—C3'1.512 (4)C9—H130.9700
C2'—H30.9700C9—H140.9700
C2'—H40.9700C9'—C10'1.525 (4)
C2—C31.512 (4)C9'—H150.9700
C2—H50.9700C9'—H160.9700
C2—H60.9700C10—H170.9700
C3—O41.424 (4)C10—H180.9700
C3—C51.524 (4)C10'—H190.9700
C3—H70.9800C10'—H200.9700
C3'—O4'1.422 (4)C11—C121.385 (5)
C3'—C5'1.528 (4)C11—H210.9300
C3'—H80.9800C11'—C12'1.386 (5)
O4—H90.8200C11'—H220.9300
O4'—H100.8200C12—C131.370 (6)
C5—O61.442 (4)C12—H230.9300
C5—C101.506 (5)C12'—C13'1.372 (5)
C5—H110.9800C12'—H240.9300
C5'—O6'1.434 (4)C13—C141.363 (6)
C5'—C10'1.505 (4)C13—F11.379 (4)
C5'—H120.9800C13'—C14'1.371 (5)
O6—C71.373 (4)C13'—F1'1.365 (4)
O6'—C7'1.386 (4)C14—H250.9300
C7—C111.377 (5)C14'—H260.9300
H1B—O1W—H2B102 (4)C14—C8—C7117.1 (3)
H1A—O2W—H2A101 (4)C14—C8—C9122.1 (3)
C2'—N1—C2111.6 (2)C7—C8—C9120.7 (3)
C2'—N1—H1109.3C7'—C8'—C14'117.2 (3)
C2—N1—H1109.3C7'—C8'—C9'121.1 (3)
C2'—N1—H2109.3C14'—C8'—C9'121.7 (3)
C2—N1—H2109.3C8—C9—C10110.6 (3)
H1—N1—H2108.0C8—C9—H13109.5
N1—C2'—C3'113.5 (3)C10—C9—H13109.5
N1—C2'—H3108.9C8—C9—H14109.5
C3'—C2'—H3108.9C10—C9—H14109.5
N1—C2'—H4108.9H13—C9—H14108.1
C3'—C2'—H4108.9C8'—C9'—C10'111.4 (3)
H3—C2'—H4107.7C8'—C9'—H15109.3
N1—C2—C3112.8 (2)C10'—C9'—H15109.3
N1—C2—H5109.0C8'—C9'—H16109.3
C3—C2—H5109.0C10'—C9'—H16109.3
N1—C2—H6109.0H15—C9'—H16108.0
C3—C2—H6109.0C5—C10—C9110.3 (3)
H5—C2—H6107.8C5—C10—H17109.6
O4—C3—C2108.0 (2)C9—C10—H17109.6
O4—C3—C5111.9 (3)C5—C10—H18109.6
C2—C3—C5109.3 (2)C9—C10—H18109.6
O4—C3—H7109.2H17—C10—H18108.1
C2—C3—H7109.2C5'—C10'—C9'110.5 (3)
C5—C3—H7109.2C5'—C10'—H19109.5
O4'—C3'—C2'107.7 (3)C9'—C10'—H19109.5
O4'—C3'—C5'110.4 (3)C5'—C10'—H20109.5
C2'—C3'—C5'111.1 (2)C9'—C10'—H20109.5
O4'—C3'—H8109.2H19—C10'—H20108.1
C2'—C3'—H8109.2C7—C11—C12120.2 (3)
C5'—C3'—H8109.2C7—C11—H21119.9
C3—O4—H9109.5C12—C11—H21119.9
C3'—O4'—H10109.5C7'—C11'—C12'120.3 (4)
O6—C5—C10111.3 (3)C7'—C11'—H22119.9
O6—C5—C3105.6 (2)C12'—C11'—H22119.9
C10—C5—C3114.5 (3)C13—C12—C11117.5 (4)
O6—C5—H11108.4C13—C12—H23121.3
C10—C5—H11108.4C11—C12—H23121.3
C3—C5—H11108.4C13'—C12'—C11'117.7 (4)
O6'—C5'—C10'110.5 (3)C13'—C12'—H24121.1
O6'—C5'—C3'105.8 (2)C11'—C12'—H24121.1
C10'—C5'—C3'114.4 (3)C14—C13—C12123.5 (4)
O6'—C5'—H12108.7C14—C13—F1119.1 (4)
C10'—C5'—H12108.7C12—C13—F1117.4 (4)
C3'—C5'—H12108.7C14'—C13'—F1'119.1 (4)
C7—O6—C5117.8 (2)C14'—C13'—C12'122.7 (3)
C7'—O6'—C5'116.2 (2)F1'—C13'—C12'118.1 (3)
O6—C7—C11115.7 (3)C13—C14—C8119.9 (4)
O6—C7—C8122.4 (3)C13—C14—H25120.1
C11—C7—C8121.8 (3)C8—C14—H25120.1
C11'—C7'—O6'115.8 (3)C13'—C14'—C8'120.0 (4)
C11'—C7'—C8'122.0 (3)C13'—C14'—H26120.0
O6'—C7'—C8'122.1 (3)C8'—C14'—H26120.0
C2—N1—C2'—C3'175.4 (3)O6'—C7'—C8'—C9'0.8 (5)
C2'—N1—C2—C3179.6 (3)C14—C8—C9—C10157.4 (4)
N1—C2—C3—O4−56.6 (3)C7—C8—C9—C10−19.6 (5)
N1—C2—C3—C5−178.5 (3)C7'—C8'—C9'—C10'11.8 (4)
N1—C2'—C3'—O4'−70.0 (4)C14'—C8'—C9'—C10'−167.6 (3)
N1—C2'—C3'—C5'169.0 (3)O6—C5—C10—C9−59.5 (4)
O4—C3—C5—O6−64.8 (3)C3—C5—C10—C9−179.1 (3)
C2—C3—C5—O654.8 (3)C8—C9—C10—C547.3 (4)
O4—C3—C5—C1058.0 (4)O6'—C5'—C10'—C9'61.2 (4)
C2—C3—C5—C10177.5 (3)C3'—C5'—C10'—C9'−179.6 (3)
O4'—C3'—C5'—O6'−167.0 (2)C8'—C9'—C10'—C5'−41.4 (4)
C2'—C3'—C5'—O6'−47.6 (3)O6—C7—C11—C12175.8 (3)
O4'—C3'—C5'—C10'71.1 (4)C8—C7—C11—C12−1.5 (5)
C2'—C3'—C5'—C10'−169.5 (3)O6'—C7'—C11'—C12'179.9 (3)
C10—C5—O6—C741.9 (4)C8'—C7'—C11'—C12'−2.0 (5)
C3—C5—O6—C7166.7 (3)C7—C11—C12—C131.5 (6)
C10'—C5'—O6'—C7'−49.5 (4)C7'—C11'—C12'—C13'−0.1 (5)
C3'—C5'—O6'—C7'−173.9 (2)C11—C12—C13—C14−1.4 (7)
C5—O6—C7—C11170.0 (3)C11—C12—C13—F1179.9 (3)
C5—O6—C7—C8−12.7 (4)C11'—C12'—C13'—C14'1.9 (6)
C5'—O6'—C7'—C11'−163.3 (3)C11'—C12'—C13'—F1'−178.6 (3)
C5'—O6'—C7'—C8'18.7 (4)C12—C13—C14—C81.3 (7)
O6—C7—C8—C14−175.8 (3)F1—C13—C14—C8180.0 (3)
C11—C7—C8—C141.3 (5)C7—C8—C14—C13−1.2 (5)
O6—C7—C8—C91.4 (5)C9—C8—C14—C13−178.3 (4)
C11—C7—C8—C9178.5 (3)F1'—C13'—C14'—C8'178.8 (3)
C11'—C7'—C8'—C14'2.2 (5)C12'—C13'—C14'—C8'−1.7 (6)
O6'—C7'—C8'—C14'−179.8 (3)C7'—C8'—C14'—C13'−0.4 (5)
C11'—C7'—C8'—C9'−177.2 (3)C9'—C8'—C14'—C13'179.0 (3)
D—H···AD—HH···AD···AD—H···A
N1—H1···O1Wi0.902.122.794 (3)131
N1—H1···O4ii0.902.373.056 (4)133
N1—H2···O4'iii0.902.193.061 (4)162
O4—H9···Cl1i0.822.673.142 (2)118
O4'—H10···O2Wii0.822.042.701 (4)137
O1W—H1B···Cl10.89 (4)2.47 (4)3.242 (2)146 (4)
O1W—H2B···N1iv0.88 (3)2.47 (4)2.794 (3)102 (3)
O2W—H1A···Cl10.89 (4)2.29 (4)3.175 (3)175 (3)
O2W—H2A···Cl1iii0.88 (4)2.37 (4)3.242 (3)171 (3)
C2'—H4···O6'0.972.262.708 (4)107
C2—H5···O60.972.352.738 (4)103
C2—H6···O6ii0.972.493.457 (4)172
C14'—H26···F1v0.932.343.213 (5)156
Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯AD—HH⋯ADAD—H⋯A
N1—H1⋯O1Wi0.902.122.794 (3)131
N1—H1⋯O4ii0.902.373.056 (4)133
N1—H2⋯O4′iii0.902.193.061 (4)162
O4—H9⋯Cl1i0.822.673.142 (2)118
O4′—H10⋯O2Wii0.822.042.701 (4)137
O1W—H1B⋯Cl10.89 (4)2.47 (4)3.242 (2)146 (4)
O1W—H2B⋯N1iv0.88 (3)2.47 (4)2.794 (3)102 (3)
O2W—H1A⋯Cl10.89 (4)2.29 (4)3.175 (3)175 (3)
O2W—H2A⋯Cl1iii0.88 (4)2.37 (4)3.242 (3)171 (3)
C2′—H4⋯O6′0.972.262.708 (4)107
C2—H5⋯O60.972.352.738 (4)103
C2—H6⋯O6ii0.972.493.457 (4)172
C14′—H26⋯F1v0.932.343.213 (5)156

Symmetry codes: (i) ; (ii) ; (iii) ; (iv) ; (v) .

  1 in total

1.  Synthesis and pharmacological properties of nebivolol, a new antihypertensive compound.

Authors:  G Van Lommen; M De Bruyn; M Schroven
Journal:  J Pharm Belg       Date:  1990 Nov-Dec
  1 in total
  2 in total

1.  A triclinic polymorph of (-)-(S)-N-benzyl-2-[(R)-6-fluoro-chroman-2-yl]-2-hy-droxy-ethanaminium bromide.

Authors:  Yoann Rousselin; Hugo Laureano; Alexandre Clavel
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2013-11-20

2.  (S,S,S,S)-Nebivolol hydro-chloride hemihydrate.

Authors:  Yoann Rousselin; Amelie Bruel; Alexandre Clavel
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2012-11-14
  2 in total

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