Literature DB >> 21584025

11β,17,21-Trihydr-oxy-6α-methyl-3,20-dioxopregna-1,4-dien-21-yl 3-carboxy-propionate.

Hui-Mei An1, Ning-Bo Gong, Yang Lu.   

Abstract

The mol-ecule of the title compound, C(26)H(34)O(8), a prednisolone derivative, contains three six-membered rings (A, B and C) and one five-membered ring (D). Ring A is planar and rings B and C adopt chair conformations, while ring D adopts an envelope conformation with the C atom bonded to the methyl group at the flap. The crystal structure is stabilized by intermolecular O-H⋯O hydrogen bonds.

Entities:  

Year:  2009        PMID: 21584025      PMCID: PMC2977682          DOI: 10.1107/S1600536809011969

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


Related literature

For the preparation, see: Anderson et al. (1984 ▶). For bond-length data, see Allen et al. (1987 ▶).

Experimental

Crystal data

C26H34O8 M = 474.53 Orthorhombic, a = 8.3125 (1) Å b = 10.1765 (1) Å c = 28.8472 (3) Å V = 2440.25 (5) Å3 Z = 4 Cu Kα radiation μ = 0.79 mm−1 T = 296 K 0.30 × 0.20 × 0.20 mm

Data collection

Bruker SMART APEX diffractometer Absorption correction: none 8346 measured reflections 3397 independent reflections 3365 reflections with I > 2σ(I) R int = 0.018 θmax = 58.8°

Refinement

R[F 2 > 2σ(F 2)] = 0.038 wR(F 2) = 0.101 S = 1.07 3397 reflections 309 parameters H-atom parameters constrained Δρmax = 0.24 e Å−3 Δρmin = −0.13 e Å−3 Absolute structure: Flack (1983 ▶), 1388 Friedel pairs Flack parameter: 0.0 (2) Data collection: SMART (Bruker, 2005 ▶); cell refinement: SAINT (Bruker, 2005 ▶); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ▶); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 ▶); molecular graphics: SHELXTL (Sheldrick, 2008 ▶); software used to prepare material for publication: SHELXL97. Crystal structure: contains datablocks I, global. DOI: 10.1107/S1600536809011969/sj2598sup1.cif Structure factors: contains datablocks I. DOI: 10.1107/S1600536809011969/sj2598Isup2.hkl Additional supplementary materials: crystallographic information; 3D view; checkCIF report
C26H34O8F(000) = 1016
Mr = 474.53Dx = 1.292 Mg m3
Orthorhombic, P212121Cu Kα radiation, λ = 1.54178 Å
Hall symbol: P 2ac 2abCell parameters from 8346 reflections
a = 8.3125 (1) Åθ = 3.1–58.8°
b = 10.1765 (1) ŵ = 0.79 mm1
c = 28.8472 (3) ÅT = 296 K
V = 2440.25 (5) Å3Block, colorless
Z = 40.30 × 0.20 × 0.20 mm
Bruker SMART APEX diffractometer3365 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tubeRint = 0.018
graphiteθmax = 58.8°, θmin = 3.1°
φ and ω scansh = −9→6
8346 measured reflectionsk = −11→10
3397 independent reflectionsl = −32→30
Refinement on F2Hydrogen site location: inferred from neighbouring sites
Least-squares matrix: fullH-atom parameters constrained
R[F2 > 2σ(F2)] = 0.038w = 1/[σ2(Fo2) + (0.0538P)2 + 0.6209P] where P = (Fo2 + 2Fc2)/3
wR(F2) = 0.101(Δ/σ)max < 0.001
S = 1.07Δρmax = 0.24 e Å3
3397 reflectionsΔρmin = −0.13 e Å3
309 parametersExtinction correction: SHELXL97 (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4
0 restraintsExtinction coefficient: 0.0070 (5)
Primary atom site location: structure-invariant direct methodsAbsolute structure: Flack (1983), 1388 Friedel pairs
Secondary atom site location: difference Fourier mapFlack parameter: 0.0 (2)
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
O1−0.8924 (3)−0.6628 (2)−0.32497 (7)0.0955 (7)
O2−0.90863 (19)−0.50797 (16)−0.09117 (6)0.0600 (4)
H2A−0.9235−0.4642−0.06770.090*
O3−0.5087 (2)−0.12455 (15)−0.12292 (5)0.0553 (4)
H3A−0.4421−0.0651−0.12240.083*
O4−0.4761 (2)−0.1328 (2)−0.00271 (6)0.0762 (6)
O5−0.7026 (3)0.04879 (18)−0.00567 (7)0.0825 (6)
O6−0.5875 (5)0.2234 (3)−0.03398 (9)0.1343 (13)
O7−0.7607 (2)0.41973 (19)0.11378 (7)0.0790 (6)
O8−0.5211 (2)0.51291 (17)0.10461 (6)0.0658 (5)
H8B−0.55160.55770.12650.099*
C1−0.9685 (4)−0.5852 (4)−0.20758 (11)0.0896 (10)
H1A−1.0508−0.5488−0.18990.107*
C2−0.9911 (5)−0.5948 (4)−0.25305 (13)0.0949 (11)
H2B−1.0868−0.5647−0.26600.114*
C3−0.8704 (4)−0.6509 (3)−0.28248 (9)0.0689 (7)
C4−0.7268 (4)−0.6966 (3)−0.26107 (8)0.0641 (7)
H4A−0.6489−0.7351−0.27980.077*
C5−0.6968 (3)−0.6878 (2)−0.21540 (8)0.0574 (6)
C6−0.5400 (4)−0.7281 (3)−0.19360 (9)0.0702 (7)
H6A−0.5652−0.7894−0.16840.084*
C7−0.4647 (3)−0.6065 (2)−0.17175 (8)0.0585 (6)
H7A−0.4334−0.5465−0.19630.070*
H7B−0.3677−0.6325−0.15540.070*
C8−0.5745 (3)−0.5339 (2)−0.13803 (7)0.0457 (5)
H8A−0.5897−0.5879−0.11020.055*
C9−0.7399 (3)−0.5045 (2)−0.15972 (7)0.0449 (5)
H9A−0.7170−0.4452−0.18560.054*
C10−0.8194 (3)−0.6292 (3)−0.18273 (8)0.0614 (7)
C11−0.8511 (3)−0.4250 (2)−0.12729 (7)0.0480 (5)
H11A−0.9444−0.3969−0.14560.058*
C12−0.7685 (3)−0.3014 (2)−0.10898 (7)0.0455 (5)
H12A−0.8361−0.2620−0.08540.055*
H12B−0.7583−0.2387−0.13410.055*
C13−0.6016 (2)−0.3268 (2)−0.08837 (7)0.0404 (5)
C14−0.5006 (3)−0.4029 (2)−0.12406 (7)0.0419 (5)
H14A−0.4994−0.3489−0.15220.050*
C15−0.3304 (3)−0.3969 (3)−0.10427 (8)0.0555 (6)
H15A−0.2510−0.4013−0.12890.067*
H15B−0.3119−0.4687−0.08280.067*
C16−0.3219 (3)−0.2647 (2)−0.07924 (8)0.0553 (6)
H16A−0.2436−0.2078−0.09400.066*
H16B−0.2909−0.2771−0.04710.066*
C17−0.4916 (3)−0.2038 (2)−0.08224 (7)0.0451 (5)
C18−0.6113 (3)−0.3993 (2)−0.04181 (7)0.0522 (5)
H18A−0.6789−0.4752−0.04500.078*
H18B−0.6557−0.3417−0.01880.078*
H18C−0.5055−0.4262−0.03250.078*
C19−0.8682 (6)−0.7359 (3)−0.14756 (11)0.1111 (15)
H19A−0.9158−0.8087−0.16370.167*
H19B−0.9445−0.7002−0.12600.167*
H19C−0.7746−0.7654−0.13110.167*
C20−0.4209 (5)−0.7970 (4)−0.22589 (13)0.1146 (14)
H20A−0.4703−0.8740−0.23880.172*
H20B−0.3269−0.8219−0.20870.172*
H20C−0.3908−0.7383−0.25050.172*
C21−0.5369 (3)−0.1198 (2)−0.04012 (8)0.0492 (5)
C22−0.6658 (5)−0.0208 (3)−0.04765 (10)0.0921 (11)
H22A−0.63140.0412−0.07120.110*
H22B−0.7619−0.0646−0.05880.110*
C23−0.6483 (3)0.1700 (3)−0.00242 (9)0.0626 (6)
C24−0.6815 (3)0.2305 (2)0.04364 (9)0.0610 (6)
H24A−0.79640.24480.04680.073*
H24B−0.64840.17020.06790.073*
C25−0.5967 (4)0.3568 (3)0.04982 (9)0.0732 (8)
H25A−0.62040.41220.02330.088*
H25B−0.48190.33980.04960.088*
C26−0.6364 (3)0.4306 (2)0.09245 (8)0.0535 (6)
U11U22U33U12U13U23
O10.141 (2)0.0889 (15)0.0562 (11)−0.0046 (15)−0.0195 (12)0.0014 (10)
O20.0627 (9)0.0618 (9)0.0556 (9)−0.0188 (8)0.0214 (8)−0.0138 (8)
O30.0654 (10)0.0508 (9)0.0496 (8)−0.0166 (8)−0.0041 (7)0.0053 (7)
O40.0738 (11)0.0993 (15)0.0554 (10)0.0139 (11)−0.0210 (9)−0.0230 (10)
O50.1149 (16)0.0537 (10)0.0791 (12)0.0066 (11)0.0027 (11)−0.0234 (9)
O60.203 (3)0.117 (2)0.0835 (15)−0.056 (2)0.0512 (19)−0.0292 (15)
O70.0697 (12)0.0676 (11)0.0996 (14)−0.0008 (10)0.0157 (11)−0.0215 (10)
O80.0699 (11)0.0586 (10)0.0689 (11)−0.0049 (9)0.0074 (9)−0.0096 (8)
C10.0519 (15)0.121 (3)0.096 (2)−0.0204 (16)0.0057 (14)−0.055 (2)
C20.0768 (19)0.111 (3)0.097 (2)−0.0051 (19)−0.0278 (17)−0.046 (2)
C30.094 (2)0.0590 (15)0.0539 (15)−0.0130 (15)−0.0066 (14)−0.0067 (12)
C40.0861 (18)0.0610 (14)0.0452 (12)−0.0075 (13)0.0079 (12)−0.0080 (11)
C50.0817 (17)0.0459 (12)0.0446 (12)−0.0125 (12)0.0056 (12)−0.0072 (10)
C60.096 (2)0.0558 (15)0.0586 (14)0.0148 (14)−0.0012 (14)−0.0162 (12)
C70.0661 (15)0.0590 (15)0.0504 (12)0.0117 (12)−0.0005 (11)−0.0078 (11)
C80.0581 (12)0.0425 (11)0.0366 (10)0.0012 (10)0.0010 (9)0.0010 (9)
C90.0526 (12)0.0475 (11)0.0346 (10)−0.0101 (10)0.0026 (9)0.0010 (9)
C100.0707 (16)0.0671 (15)0.0463 (12)−0.0268 (13)0.0154 (11)−0.0148 (12)
C110.0427 (11)0.0522 (12)0.0491 (12)−0.0067 (10)0.0006 (9)−0.0028 (10)
C120.0429 (11)0.0462 (11)0.0475 (11)0.0021 (9)0.0019 (9)−0.0050 (9)
C130.0444 (11)0.0423 (10)0.0347 (9)−0.0016 (9)0.0021 (9)−0.0032 (8)
C140.0438 (11)0.0432 (11)0.0388 (10)0.0023 (9)0.0010 (8)0.0011 (8)
C150.0454 (12)0.0651 (14)0.0561 (13)0.0079 (11)−0.0018 (10)−0.0045 (11)
C160.0441 (12)0.0653 (15)0.0565 (13)−0.0061 (11)−0.0040 (10)−0.0041 (11)
C170.0480 (12)0.0471 (11)0.0403 (10)−0.0061 (10)−0.0040 (9)−0.0013 (9)
C180.0594 (14)0.0578 (13)0.0395 (11)−0.0009 (11)0.0023 (10)0.0005 (10)
C190.177 (4)0.074 (2)0.082 (2)−0.067 (2)0.061 (2)−0.0293 (16)
C200.117 (3)0.117 (3)0.110 (3)0.043 (3)−0.017 (2)−0.064 (2)
C210.0519 (12)0.0467 (12)0.0491 (12)−0.0089 (10)−0.0068 (10)−0.0055 (10)
C220.134 (3)0.0685 (17)0.0741 (18)0.0392 (19)−0.0296 (19)−0.0313 (15)
C230.0626 (14)0.0628 (15)0.0626 (15)0.0128 (12)0.0165 (12)−0.0202 (12)
C240.0611 (14)0.0546 (13)0.0672 (14)−0.0023 (12)0.0081 (12)−0.0114 (12)
C250.106 (2)0.0581 (15)0.0559 (14)−0.0167 (16)0.0171 (14)−0.0035 (12)
C260.0596 (14)0.0410 (11)0.0598 (13)0.0061 (11)0.0006 (12)0.0053 (10)
O1—C31.245 (3)C11—H11A0.9800
O2—C111.424 (3)C12—C131.531 (3)
O2—H2A0.8200C12—H12A0.9700
O3—C171.431 (3)C12—H12B0.9700
O3—H3A0.8200C13—C181.535 (3)
O4—C211.199 (3)C13—C141.538 (3)
O5—C231.316 (3)C13—C171.561 (3)
O5—C221.436 (3)C14—C151.527 (3)
O6—C231.175 (3)C14—H14A0.9800
O7—C261.208 (3)C15—C161.529 (4)
O8—C261.320 (3)C15—H15A0.9700
O8—H8B0.8200C15—H15B0.9700
C1—C21.329 (5)C16—C171.543 (3)
C1—C101.500 (5)C16—H16A0.9700
C1—H1A0.9300C16—H16B0.9700
C2—C31.433 (5)C17—C211.532 (3)
C2—H2B0.9300C18—H18A0.9600
C3—C41.423 (4)C18—H18B0.9600
C4—C51.344 (3)C18—H18C0.9600
C4—H4A0.9300C19—H19A0.9600
C5—C61.504 (4)C19—H19B0.9600
C5—C101.511 (3)C19—H19C0.9600
C6—C71.524 (4)C20—H20A0.9600
C6—C201.529 (4)C20—H20B0.9600
C6—H6A0.9800C20—H20C0.9600
C7—C81.525 (3)C21—C221.486 (4)
C7—H7A0.9700C22—H22A0.9700
C7—H7B0.9700C22—H22B0.9700
C8—C141.522 (3)C23—C241.490 (4)
C8—C91.540 (3)C24—C251.476 (4)
C8—H8A0.9800C24—H24A0.9700
C9—C111.544 (3)C24—H24B0.9700
C9—C101.576 (3)C25—C261.478 (3)
C9—H9A0.9800C25—H25A0.9700
C10—C191.541 (4)C25—H25B0.9700
C11—C121.528 (3)
C11—O2—H2A109.5C8—C14—C13113.46 (17)
C17—O3—H3A109.5C15—C14—C13103.62 (16)
C23—O5—C22116.7 (3)C8—C14—H14A106.1
C26—O8—H8B109.5C15—C14—H14A106.1
C2—C1—C10124.5 (3)C13—C14—H14A106.1
C2—C1—H1A117.7C14—C15—C16104.76 (18)
C10—C1—H1A117.7C14—C15—H15A110.8
C1—C2—C3121.0 (3)C16—C15—H15A110.8
C1—C2—H2B119.5C14—C15—H15B110.8
C3—C2—H2B119.5C16—C15—H15B110.8
O1—C3—C4121.3 (3)H15A—C15—H15B108.9
O1—C3—C2121.3 (3)C15—C16—C17106.55 (17)
C4—C3—C2117.4 (2)C15—C16—H16A110.4
C5—C4—C3124.0 (3)C17—C16—H16A110.4
C5—C4—H4A118.0C15—C16—H16B110.4
C3—C4—H4A118.0C17—C16—H16B110.4
C4—C5—C6123.5 (2)H16A—C16—H16B108.6
C4—C5—C10120.9 (3)O3—C17—C21108.18 (17)
C6—C5—C10115.6 (2)O3—C17—C16111.29 (18)
C5—C6—C7107.9 (2)C21—C17—C16113.85 (17)
C5—C6—C20115.6 (2)O3—C17—C13107.50 (15)
C7—C6—C20111.0 (3)C21—C17—C13113.13 (17)
C5—C6—H6A107.3C16—C17—C13102.70 (17)
C7—C6—H6A107.3C13—C18—H18A109.5
C20—C6—H6A107.3C13—C18—H18B109.5
C6—C7—C8114.3 (2)H18A—C18—H18B109.5
C6—C7—H7A108.7C13—C18—H18C109.5
C8—C7—H7A108.7H18A—C18—H18C109.5
C6—C7—H7B108.7H18B—C18—H18C109.5
C8—C7—H7B108.7C10—C19—H19A109.5
H7A—C7—H7B107.6C10—C19—H19B109.5
C14—C8—C7110.58 (19)H19A—C19—H19B109.5
C14—C8—C9107.34 (17)C10—C19—H19C109.5
C7—C8—C9111.67 (17)H19A—C19—H19C109.5
C14—C8—H8A109.1H19B—C19—H19C109.5
C7—C8—H8A109.1C6—C20—H20A109.5
C9—C8—H8A109.1C6—C20—H20B109.5
C8—C9—C11112.95 (16)H20A—C20—H20B109.5
C8—C9—C10112.9 (2)C6—C20—H20C109.5
C11—C9—C10115.20 (18)H20A—C20—H20C109.5
C8—C9—H9A104.8H20B—C20—H20C109.5
C11—C9—H9A104.8O4—C21—C22120.7 (2)
C10—C9—H9A104.8O4—C21—C17123.3 (2)
C1—C10—C5112.1 (2)C22—C21—C17116.05 (19)
C1—C10—C19107.9 (3)O5—C22—C21111.4 (2)
C5—C10—C19108.0 (2)O5—C22—H22A109.3
C1—C10—C9107.9 (2)C21—C22—H22A109.3
C5—C10—C9107.33 (19)O5—C22—H22B109.3
C19—C10—C9113.6 (2)C21—C22—H22B109.3
O2—C11—C12112.71 (17)H22A—C22—H22B108.0
O2—C11—C9109.50 (17)O6—C23—O5121.7 (3)
C12—C11—C9111.83 (17)O6—C23—C24125.4 (3)
O2—C11—H11A107.5O5—C23—C24112.8 (2)
C12—C11—H11A107.5C25—C24—C23112.3 (2)
C9—C11—H11A107.5C25—C24—H24A109.1
C11—C12—C13113.76 (18)C23—C24—H24A109.1
C11—C12—H12A108.8C25—C24—H24B109.1
C13—C12—H12A108.8C23—C24—H24B109.1
C11—C12—H12B108.8H24A—C24—H24B107.9
C13—C12—H12B108.8C24—C25—C26115.9 (2)
H12A—C12—H12B107.7C24—C25—H25A108.3
C12—C13—C18111.91 (17)C26—C25—H25A108.3
C12—C13—C14108.65 (16)C24—C25—H25B108.3
C18—C13—C14111.88 (17)C26—C25—H25B108.3
C12—C13—C17116.09 (17)H25A—C25—H25B107.4
C18—C13—C17108.49 (16)O7—C26—O8122.9 (2)
C14—C13—C1799.21 (16)O7—C26—C25124.6 (2)
C8—C14—C15120.54 (19)O8—C26—C25112.4 (2)
C10—C1—C2—C30.5 (6)C11—C12—C13—C17163.05 (17)
C1—C2—C3—O1178.4 (3)C7—C8—C14—C15−53.9 (3)
C1—C2—C3—C40.6 (5)C9—C8—C14—C15−175.90 (17)
O1—C3—C4—C5−179.3 (3)C7—C8—C14—C13−177.51 (17)
C2—C3—C4—C5−1.5 (4)C9—C8—C14—C1360.5 (2)
C3—C4—C5—C6−175.7 (2)C12—C13—C14—C8−59.0 (2)
C3—C4—C5—C101.3 (4)C18—C13—C14—C865.1 (2)
C4—C5—C6—C7117.5 (3)C17—C13—C14—C8179.37 (16)
C10—C5—C6—C7−59.6 (3)C12—C13—C14—C15168.57 (18)
C4—C5—C6—C20−7.4 (4)C18—C13—C14—C15−67.4 (2)
C10—C5—C6—C20175.5 (3)C17—C13—C14—C1546.91 (19)
C5—C6—C7—C853.9 (3)C8—C14—C15—C16−160.51 (19)
C20—C6—C7—C8−178.5 (3)C13—C14—C15—C16−32.3 (2)
C6—C7—C8—C14−170.77 (19)C14—C15—C16—C174.3 (2)
C6—C7—C8—C9−51.3 (3)C15—C16—C17—O3−90.0 (2)
C14—C8—C9—C11−55.8 (2)C15—C16—C17—C21147.40 (19)
C7—C8—C9—C11−177.16 (18)C15—C16—C17—C1324.7 (2)
C14—C8—C9—C10171.28 (17)C12—C13—C17—O3−42.1 (2)
C7—C8—C9—C1049.9 (2)C18—C13—C17—O3−169.09 (17)
C2—C1—C10—C5−0.7 (5)C14—C13—C17—O374.02 (19)
C2—C1—C10—C19−119.6 (4)C12—C13—C17—C2177.3 (2)
C2—C1—C10—C9117.3 (4)C18—C13—C17—C21−49.7 (2)
C4—C5—C10—C1−0.2 (4)C14—C13—C17—C21−166.61 (17)
C6—C5—C10—C1177.0 (2)C12—C13—C17—C16−159.55 (17)
C4—C5—C10—C19118.6 (3)C18—C13—C17—C1673.4 (2)
C6—C5—C10—C19−64.2 (3)C14—C13—C17—C16−43.45 (18)
C4—C5—C10—C9−118.5 (2)O3—C17—C21—O4−147.7 (2)
C6—C5—C10—C958.7 (3)C16—C17—C21—O4−23.4 (3)
C8—C9—C10—C1−173.07 (19)C13—C17—C21—O493.4 (3)
C11—C9—C10—C155.1 (3)O3—C17—C21—C2233.7 (3)
C8—C9—C10—C5−52.0 (2)C16—C17—C21—C22157.9 (2)
C11—C9—C10—C5176.16 (19)C13—C17—C21—C22−85.3 (3)
C8—C9—C10—C1967.3 (3)C23—O5—C22—C21104.9 (3)
C11—C9—C10—C19−64.5 (3)O4—C21—C22—O5−0.8 (4)
C8—C9—C11—O2−73.8 (2)C17—C21—C22—O5177.9 (2)
C10—C9—C11—O258.0 (2)C22—O5—C23—O67.7 (5)
C8—C9—C11—C1251.9 (2)C22—O5—C23—C24−175.6 (2)
C10—C9—C11—C12−176.30 (18)O6—C23—C24—C25−13.2 (5)
O2—C11—C12—C1373.8 (2)O5—C23—C24—C25170.2 (3)
C9—C11—C12—C13−50.1 (2)C23—C24—C25—C26173.7 (2)
C11—C12—C13—C18−71.7 (2)C24—C25—C26—O7−24.4 (4)
C11—C12—C13—C1452.4 (2)C24—C25—C26—O8156.8 (2)
D—H···AD—HH···AD···AD—H···A
O2—H2A···O4i0.822.303.115 (2)172
O3—H3A···O7ii0.822.132.943 (2)173
O8—H8B···O1iii0.821.822.640 (3)176
Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯AD—HH⋯ADAD—H⋯A
O2—H2A⋯O4i0.822.303.115 (2)172
O3—H3A⋯O7ii0.822.132.943 (2)173
O8—H8B⋯O1iii0.821.822.640 (3)176

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

  2 in total

1.  A short history of SHELX.

Authors:  George M Sheldrick
Journal:  Acta Crystallogr A       Date:  2007-12-21       Impact factor: 2.290

2.  Carboxyl group catalysis of acyl transfer reactions in corticosteroid 17- and 21-monoesters.

Authors:  B D Anderson; R A Conradi; W J Lambert
Journal:  J Pharm Sci       Date:  1984-05       Impact factor: 3.534

  2 in total

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