Literature DB >> 21522938

(22E,24R)-3α,5-Cyclo-5α-ergosta-22-en-6-one.

Liu-Qing Sheng, Fang Zeng, Fei Chen, Chun-Nian Xia.   

Abstract

In the title mol-ecule, C(28)H(44)O, the two six-membered rings have a chair conformation and the two five-membered rings haveenvelope conformations. The crystal packing exhibits no short inter-molecular contacts. The absolute configuration was assigned to correspond with that of the known chiral centres in a precursor molecule, which remained unchanged during the synthesis of the title compound.

Entities:  

Year:  2011        PMID: 21522938      PMCID: PMC3051649          DOI: 10.1107/S1600536810052906

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


Related literature

Many analogues of brassinolide as plant regulators have been isolated from a wide variety of plants, and many attempts have been undertaken to synthesize these brassinosteroids, see, for example: Aburatani et al. (1987 ▶); Brosa et al. (2001 ▶); Brosa & Santamarta (1999 ▶); McMorris et al. (1993 ▶); Clouse (1996 ▶, 2002 ▶). For related structures, see: Chen et al. (2009 ▶); Xia et al. (2005 ▶).

Experimental

Crystal data

C28H44O M = 396.63 Orthorhombic, a = 7.6628 (19) Å b = 10.516 (3) Å c = 29.855 (8) Å V = 2405.9 (11) Å3 Z = 4 Mo Kα radiation μ = 0.06 mm−1 T = 123 K 0.42 × 0.36 × 0.34 mm

Data collection

Rigaku AFC10/Saturn724+ diffractometer 18847 measured reflections 3143 independent reflections 2973 reflections with I > 2σ(I) R int = 0.028

Refinement

R[F 2 > 2σ(F 2)] = 0.038 wR(F 2) = 0.086 S = 1.00 3143 reflections 268 parameters H-atom parameters constrained Δρmax = 0.25 e Å−3 Δρmin = −0.13 e Å−3 Data collection: CrystalClear (Rigaku/MSC, 2008 ▶); cell refinement: CrystalClear; data reduction: CrystalClear; 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: publCIF (Westrip, 2010 ▶) and PLATON (Spek, 2009 ▶). Crystal structure: contains datablocks I, global. DOI: 10.1107/S1600536810052906/cv5014sup1.cif Structure factors: contains datablocks I. DOI: 10.1107/S1600536810052906/cv5014Isup2.hkl Additional supplementary materials: crystallographic information; 3D view; checkCIF report
C28H44ODx = 1.095 Mg m3
Mr = 396.63Melting point = 441–442 K
Orthorhombic, P212121Mo Kα radiation, λ = 0.71073 Å
Hall symbol: P 2ac 2abCell parameters from 7977 reflections
a = 7.6628 (19) Åθ = 3.3–27.5°
b = 10.516 (3) ŵ = 0.06 mm1
c = 29.855 (8) ÅT = 123 K
V = 2405.9 (11) Å3Block, colourless
Z = 40.42 × 0.36 × 0.34 mm
F(000) = 880
Rigaku AFC10/Saturn724+ diffractometer2973 reflections with I > 2σ(I)
Radiation source: Rotating AnodeRint = 0.028
graphiteθmax = 27.5°, θmin = 3.3°
Detector resolution: 28.5714 pixels mm-1h = −9→8
phi and ω scansk = −12→13
18847 measured reflectionsl = −38→38
3143 independent reflections
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.038Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.086H-atom parameters constrained
S = 1.00w = 1/[σ2(Fo2) + (0.0381P)2 + 0.526P] where P = (Fo2 + 2Fc2)/3
3143 reflections(Δ/σ)max < 0.001
268 parametersΔρmax = 0.25 e Å3
0 restraintsΔρmin = −0.13 e Å3
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
O10.30218 (17)0.98106 (15)0.72666 (5)0.0450 (4)
C10.8956 (2)1.11208 (17)0.71079 (6)0.0336 (4)
H1A0.94641.12500.74090.040*
H1B0.99181.10690.68870.040*
C20.7725 (3)1.22209 (17)0.69899 (7)0.0386 (4)
H2A0.81111.30200.71350.046*
H2B0.76781.23530.66620.046*
C30.5968 (2)1.18107 (18)0.71677 (7)0.0388 (4)
H30.48931.22170.70430.047*
C40.5881 (3)1.1216 (2)0.76191 (6)0.0456 (5)
H4A0.47501.12460.77790.055*
H4B0.69201.12920.78140.055*
C50.6013 (2)1.03587 (18)0.72191 (6)0.0318 (4)
C60.4414 (2)0.96834 (18)0.70745 (6)0.0320 (4)
C70.4549 (2)0.89255 (17)0.66471 (5)0.0282 (3)
H7A0.42750.94920.63920.034*
H7B0.36570.82450.66530.034*
C80.6335 (2)0.83190 (15)0.65663 (5)0.0241 (3)
H80.65070.76290.67920.029*
C90.7817 (2)0.92938 (15)0.66207 (5)0.0236 (3)
H90.75771.00020.64060.028*
C100.7850 (2)0.98849 (17)0.70976 (5)0.0276 (3)
C110.9591 (2)0.87132 (17)0.64884 (6)0.0275 (3)
H11A1.04780.93970.64840.033*
H11B0.99420.80920.67210.033*
C120.9587 (2)0.80429 (16)0.60302 (5)0.0265 (3)
H12A0.94100.86830.57910.032*
H12B1.07350.76350.59810.032*
C130.8151 (2)0.70341 (14)0.59999 (5)0.0235 (3)
C140.64205 (19)0.77281 (15)0.61000 (5)0.0237 (3)
H140.63490.84500.58830.028*
C150.5007 (2)0.67829 (17)0.59621 (6)0.0306 (4)
H15A0.39080.72270.58850.037*
H15B0.47720.61650.62050.037*
C160.5795 (2)0.61158 (16)0.55473 (6)0.0296 (4)
H16A0.51750.63850.52720.035*
H16B0.56900.51810.55770.035*
C170.7754 (2)0.65110 (15)0.55229 (5)0.0247 (3)
H170.78380.72430.53100.030*
C180.8492 (2)0.59299 (16)0.63263 (5)0.0304 (4)
H18A0.96350.55530.62620.046*
H18B0.75820.52830.62900.046*
H18C0.84760.62500.66350.046*
C190.8522 (2)0.89395 (19)0.74489 (5)0.0372 (4)
H19A0.83190.92840.77490.056*
H19B0.97740.88010.74050.056*
H19C0.79010.81300.74170.056*
C200.8887 (2)0.54309 (15)0.53322 (5)0.0267 (3)
H200.87580.46750.55330.032*
C211.0830 (2)0.57688 (17)0.53063 (6)0.0338 (4)
H21A1.14550.50990.51440.051*
H21B1.13060.58430.56100.051*
H21C1.09720.65800.51490.051*
C220.8252 (2)0.50642 (15)0.48723 (5)0.0286 (4)
H220.83510.56830.46420.034*
C230.7573 (2)0.39577 (16)0.47638 (5)0.0285 (4)
H230.74630.33520.49980.034*
C240.6951 (2)0.35497 (16)0.43073 (5)0.0287 (4)
H240.71610.42650.40930.034*
C250.7985 (3)0.23792 (17)0.41424 (6)0.0355 (4)
H250.78120.16800.43650.043*
C260.7347 (3)0.1902 (2)0.36895 (7)0.0510 (6)
H26A0.74210.25920.34690.077*
H26B0.61320.16200.37160.077*
H26C0.80760.11890.35920.077*
C270.9935 (3)0.2666 (2)0.41187 (6)0.0413 (5)
H27A1.01390.33590.39050.062*
H27B1.05630.19050.40200.062*
H27C1.03540.29200.44160.062*
C280.4989 (3)0.3298 (2)0.43273 (6)0.0406 (4)
H28A0.47660.25470.45130.061*
H28B0.45450.31480.40240.061*
H28C0.43970.40360.44580.061*
U11U22U33U12U13U23
O10.0238 (7)0.0577 (9)0.0534 (8)0.0054 (7)0.0097 (6)−0.0095 (7)
C10.0242 (8)0.0391 (9)0.0375 (9)0.0002 (8)−0.0065 (7)−0.0092 (8)
C20.0339 (10)0.0321 (9)0.0498 (11)0.0007 (8)−0.0100 (8)−0.0125 (8)
C30.0303 (10)0.0372 (9)0.0489 (10)0.0098 (8)−0.0078 (8)−0.0138 (8)
C40.0318 (10)0.0638 (13)0.0413 (10)0.0091 (10)0.0019 (8)−0.0193 (10)
C50.0226 (8)0.0393 (9)0.0335 (8)0.0072 (8)−0.0004 (7)−0.0051 (7)
C60.0217 (8)0.0359 (9)0.0383 (9)0.0072 (7)0.0020 (7)0.0040 (8)
C70.0171 (7)0.0303 (8)0.0373 (8)0.0006 (7)0.0002 (6)0.0013 (7)
C80.0166 (7)0.0251 (7)0.0306 (8)0.0016 (6)0.0011 (6)0.0038 (6)
C90.0171 (7)0.0265 (7)0.0271 (7)0.0001 (6)−0.0015 (6)0.0008 (6)
C100.0193 (8)0.0349 (9)0.0285 (8)0.0040 (7)−0.0027 (6)−0.0018 (7)
C110.0150 (7)0.0309 (8)0.0366 (8)−0.0004 (6)−0.0016 (6)−0.0033 (7)
C120.0151 (7)0.0285 (8)0.0358 (8)−0.0011 (6)0.0029 (6)−0.0034 (7)
C130.0187 (7)0.0227 (7)0.0289 (7)0.0012 (6)−0.0004 (6)0.0010 (6)
C140.0165 (7)0.0238 (7)0.0308 (8)−0.0008 (6)−0.0012 (6)0.0035 (6)
C150.0196 (8)0.0313 (9)0.0408 (9)−0.0039 (7)−0.0005 (7)−0.0010 (7)
C160.0233 (8)0.0276 (8)0.0379 (8)−0.0037 (7)−0.0024 (7)0.0004 (7)
C170.0215 (8)0.0230 (7)0.0295 (7)−0.0011 (6)−0.0010 (6)0.0033 (6)
C180.0292 (8)0.0286 (8)0.0334 (8)0.0050 (7)−0.0005 (7)0.0036 (7)
C190.0304 (9)0.0514 (11)0.0299 (8)0.0075 (9)−0.0035 (7)0.0041 (8)
C200.0267 (8)0.0235 (7)0.0299 (8)0.0007 (7)0.0008 (6)0.0018 (6)
C210.0271 (9)0.0346 (9)0.0397 (9)0.0015 (8)0.0027 (7)−0.0029 (8)
C220.0297 (9)0.0265 (8)0.0295 (8)0.0018 (7)0.0021 (7)0.0038 (6)
C230.0300 (9)0.0276 (8)0.0280 (7)−0.0006 (7)0.0009 (6)0.0056 (7)
C240.0309 (9)0.0266 (8)0.0285 (8)−0.0059 (7)−0.0004 (7)0.0052 (6)
C250.0479 (11)0.0264 (8)0.0324 (8)−0.0017 (8)0.0036 (8)0.0029 (7)
C260.0627 (15)0.0449 (11)0.0456 (11)−0.0063 (11)0.0038 (10)−0.0136 (9)
C270.0436 (11)0.0405 (10)0.0397 (10)0.0084 (9)0.0043 (9)0.0035 (9)
C280.0353 (10)0.0442 (11)0.0423 (10)−0.0095 (9)−0.0026 (8)0.0002 (9)
O1—C61.219 (2)C15—H15A0.9900
C1—C21.533 (2)C15—H15B0.9900
C1—C101.552 (2)C16—C171.559 (2)
C1—H1A0.9900C16—H16A0.9900
C1—H1B0.9900C16—H16B0.9900
C2—C31.511 (3)C17—C201.539 (2)
C2—H2A0.9900C17—H171.0000
C2—H2B0.9900C18—H18A0.9800
C3—C41.487 (3)C18—H18B0.9800
C3—C51.535 (3)C18—H18C0.9800
C3—H31.0000C19—H19A0.9800
C4—C51.500 (2)C19—H19B0.9800
C4—H4A0.9900C19—H19C0.9800
C4—H4B0.9900C20—C221.507 (2)
C5—C61.481 (2)C20—C211.533 (2)
C5—C101.536 (2)C20—H201.0000
C6—C71.509 (2)C21—H21A0.9800
C7—C81.528 (2)C21—H21B0.9800
C7—H7A0.9900C21—H21C0.9800
C7—H7B0.9900C22—C231.316 (2)
C8—C141.526 (2)C22—H220.9500
C8—C91.539 (2)C23—C241.507 (2)
C8—H81.0000C23—H230.9500
C9—C111.542 (2)C24—C281.526 (3)
C9—C101.554 (2)C24—C251.546 (2)
C9—H91.0000C24—H241.0000
C10—C191.534 (2)C25—C261.522 (2)
C11—C121.539 (2)C25—C271.525 (3)
C11—H11A0.9900C25—H251.0000
C11—H11B0.9900C26—H26A0.9800
C12—C131.531 (2)C26—H26B0.9800
C12—H12A0.9900C26—H26C0.9800
C12—H12B0.9900C27—H27A0.9800
C13—C181.538 (2)C27—H27B0.9800
C13—C141.543 (2)C27—H27C0.9800
C13—C171.558 (2)C28—H28A0.9800
C14—C151.527 (2)C28—H28B0.9800
C14—H141.0000C28—H28C0.9800
C15—C161.546 (2)
C2—C1—C10106.93 (13)C13—C14—H14106.3
C2—C1—H1A110.3C14—C15—C16103.54 (13)
C10—C1—H1A110.3C14—C15—H15A111.1
C2—C1—H1B110.3C16—C15—H15A111.1
C10—C1—H1B110.3C14—C15—H15B111.1
H1A—C1—H1B108.6C16—C15—H15B111.1
C3—C2—C1104.63 (15)H15A—C15—H15B109.0
C3—C2—H2A110.8C15—C16—C17107.05 (13)
C1—C2—H2A110.8C15—C16—H16A110.3
C3—C2—H2B110.8C17—C16—H16A110.3
C1—C2—H2B110.8C15—C16—H16B110.3
H2A—C2—H2B108.9C17—C16—H16B110.3
C4—C3—C2118.56 (16)H16A—C16—H16B108.6
C4—C3—C559.46 (13)C20—C17—C13119.25 (13)
C2—C3—C5107.35 (15)C20—C17—C16111.34 (13)
C4—C3—H3118.8C13—C17—C16103.83 (12)
C2—C3—H3118.8C20—C17—H17107.3
C5—C3—H3118.8C13—C17—H17107.3
C3—C4—C561.86 (12)C16—C17—H17107.3
C3—C4—H4A117.6C13—C18—H18A109.5
C5—C4—H4A117.6C13—C18—H18B109.5
C3—C4—H4B117.6H18A—C18—H18B109.5
C5—C4—H4B117.6C13—C18—H18C109.5
H4A—C4—H4B114.7H18A—C18—H18C109.5
C6—C5—C4117.68 (15)H18B—C18—H18C109.5
C6—C5—C3115.35 (15)C10—C19—H19A109.5
C4—C5—C358.68 (13)C10—C19—H19B109.5
C6—C5—C10122.22 (14)H19A—C19—H19B109.5
C4—C5—C10116.48 (14)C10—C19—H19C109.5
C3—C5—C10108.69 (15)H19A—C19—H19C109.5
O1—C6—C5122.30 (17)H19B—C19—H19C109.5
O1—C6—C7121.09 (16)C22—C20—C21109.13 (14)
C5—C6—C7116.34 (14)C22—C20—C17110.07 (13)
C6—C7—C8114.52 (13)C21—C20—C17113.28 (13)
C6—C7—H7A108.6C22—C20—H20108.1
C8—C7—H7A108.6C21—C20—H20108.1
C6—C7—H7B108.6C17—C20—H20108.1
C8—C7—H7B108.6C20—C21—H21A109.5
H7A—C7—H7B107.6C20—C21—H21B109.5
C14—C8—C7110.61 (12)H21A—C21—H21B109.5
C14—C8—C9109.61 (12)C20—C21—H21C109.5
C7—C8—C9111.50 (13)H21A—C21—H21C109.5
C14—C8—H8108.3H21B—C21—H21C109.5
C7—C8—H8108.3C23—C22—C20125.33 (14)
C9—C8—H8108.3C23—C22—H22117.3
C8—C9—C11111.11 (12)C20—C22—H22117.3
C8—C9—C10112.03 (12)C22—C23—C24126.84 (14)
C11—C9—C10112.28 (12)C22—C23—H23116.6
C8—C9—H9107.0C24—C23—H23116.6
C11—C9—H9107.0C23—C24—C28109.02 (14)
C10—C9—H9107.0C23—C24—C25110.59 (14)
C19—C10—C5110.86 (14)C28—C24—C25112.30 (15)
C19—C10—C1110.24 (13)C23—C24—H24108.3
C5—C10—C1102.93 (13)C28—C24—H24108.3
C19—C10—C9111.87 (14)C25—C24—H24108.3
C5—C10—C9109.40 (12)C26—C25—C27109.82 (16)
C1—C10—C9111.20 (13)C26—C25—C24112.33 (16)
C12—C11—C9114.02 (13)C27—C25—C24111.04 (15)
C12—C11—H11A108.7C26—C25—H25107.8
C9—C11—H11A108.7C27—C25—H25107.8
C12—C11—H11B108.7C24—C25—H25107.8
C9—C11—H11B108.7C25—C26—H26A109.5
H11A—C11—H11B107.6C25—C26—H26B109.5
C13—C12—C11111.80 (13)H26A—C26—H26B109.5
C13—C12—H12A109.3C25—C26—H26C109.5
C11—C12—H12A109.3H26A—C26—H26C109.5
C13—C12—H12B109.3H26B—C26—H26C109.5
C11—C12—H12B109.3C25—C27—H27A109.5
H12A—C12—H12B107.9C25—C27—H27B109.5
C12—C13—C18111.35 (13)H27A—C27—H27B109.5
C12—C13—C14106.13 (12)C25—C27—H27C109.5
C18—C13—C14112.40 (12)H27A—C27—H27C109.5
C12—C13—C17116.03 (12)H27B—C27—H27C109.5
C18—C13—C17110.25 (12)C24—C28—H28A109.5
C14—C13—C17100.14 (12)C24—C28—H28B109.5
C8—C14—C15118.71 (13)H28A—C28—H28B109.5
C8—C14—C13113.96 (12)C24—C28—H28C109.5
C15—C14—C13104.43 (12)H28A—C28—H28C109.5
C8—C14—H14106.3H28B—C28—H28C109.5
C15—C14—H14106.3
C10—C1—C2—C331.09 (18)C11—C9—C10—C170.92 (16)
C1—C2—C3—C443.3 (2)C8—C9—C11—C1250.03 (18)
C1—C2—C3—C5−20.85 (19)C10—C9—C11—C12176.38 (13)
C2—C3—C4—C5−94.19 (18)C9—C11—C12—C13−54.27 (18)
C3—C4—C5—C6−104.28 (18)C11—C12—C13—C18−65.93 (17)
C3—C4—C5—C1096.66 (18)C11—C12—C13—C1456.69 (16)
C4—C3—C5—C6108.27 (17)C11—C12—C13—C17166.88 (13)
C2—C3—C5—C6−138.33 (15)C7—C8—C14—C15−53.32 (18)
C2—C3—C5—C4113.41 (17)C9—C8—C14—C15−176.67 (13)
C4—C3—C5—C10−110.19 (16)C7—C8—C14—C13−177.00 (13)
C2—C3—C5—C103.2 (2)C9—C8—C14—C1359.65 (16)
C4—C5—C6—O10.4 (3)C12—C13—C14—C8−61.60 (15)
C3—C5—C6—O1−66.0 (2)C18—C13—C14—C860.35 (17)
C10—C5—C6—O1158.13 (18)C17—C13—C14—C8177.35 (12)
C4—C5—C6—C7174.52 (15)C12—C13—C14—C15167.31 (13)
C3—C5—C6—C7108.16 (18)C18—C13—C14—C15−70.75 (15)
C10—C5—C6—C7−27.7 (2)C17—C13—C14—C1546.26 (14)
O1—C6—C7—C8−152.17 (17)C8—C14—C15—C16−164.04 (13)
C5—C6—C7—C833.6 (2)C13—C14—C15—C16−35.79 (15)
C6—C7—C8—C14−172.34 (13)C14—C15—C16—C1711.02 (16)
C6—C7—C8—C9−50.10 (18)C12—C13—C17—C2083.68 (17)
C14—C8—C9—C11−50.93 (16)C18—C13—C17—C20−44.06 (18)
C7—C8—C9—C11−173.74 (13)C14—C13—C17—C20−162.65 (13)
C14—C8—C9—C10−177.42 (12)C12—C13—C17—C16−151.75 (13)
C7—C8—C9—C1059.77 (16)C18—C13—C17—C1680.52 (15)
C6—C5—C10—C19−88.33 (19)C14—C13—C17—C16−38.08 (14)
C4—C5—C10—C1969.7 (2)C15—C16—C17—C20146.76 (13)
C3—C5—C10—C19133.29 (16)C15—C16—C17—C1317.23 (16)
C6—C5—C10—C1153.80 (16)C13—C17—C20—C22179.04 (13)
C4—C5—C10—C1−48.18 (19)C16—C17—C20—C2258.18 (17)
C3—C5—C10—C115.43 (17)C13—C17—C20—C21−58.47 (18)
C6—C5—C10—C935.5 (2)C16—C17—C20—C21−179.34 (13)
C4—C5—C10—C9−166.48 (15)C21—C20—C22—C23120.14 (18)
C3—C5—C10—C9−102.87 (15)C17—C20—C22—C23−114.96 (19)
C2—C1—C10—C19−146.85 (15)C20—C22—C23—C24−179.02 (15)
C2—C1—C10—C5−28.55 (17)C22—C23—C24—C28−116.44 (19)
C2—C1—C10—C988.48 (16)C22—C23—C24—C25119.62 (19)
C8—C9—C10—C1973.02 (17)C23—C24—C25—C26177.68 (15)
C11—C9—C10—C19−52.83 (18)C28—C24—C25—C2655.6 (2)
C8—C9—C10—C5−50.22 (17)C23—C24—C25—C27−58.90 (18)
C11—C9—C10—C5−176.07 (14)C28—C24—C25—C27179.07 (15)
C8—C9—C10—C1−163.23 (12)
  4 in total

Review 1.  Brassinosteroid signaling: novel downstream components emerge.

Authors:  Steven D Clouse
Journal:  Curr Biol       Date:  2002-07-23       Impact factor: 10.834

2.  A short history of SHELX.

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

Review 3.  Plant hormones: brassinosteroids in the spotlight.

Authors:  S D Clouse
Journal:  Curr Biol       Date:  1996-06-01       Impact factor: 10.834

4.  Structure validation in chemical crystallography.

Authors:  Anthony L Spek
Journal:  Acta Crystallogr D Biol Crystallogr       Date:  2009-01-20
  4 in total
  1 in total

1.  (22E,24R)-5α-Ergosta-2,22-dien-6-one.

Authors:  Liu-Qing Sheng; Fang Zeng; Fei Chen; Chun-Nian Xia
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2011-01-29
  1 in total

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