| Dankasterone
Dankasterone, produced by a strain og Gymnascella dankaliensis from the marine sponge Halichondria japonica, is a novel class of steroid with significant cytotoxicity against tumour cells in culture. 
Date: Oct.1999 |
 This structer was produced by RasMol. |
ORTEP-III (Burnett, 1996) drawing
Paper: Dankasterone, a new class of cytotoxic steroid produced by a Gymnascella species from a marine sponge
Taro Amagata, Mitsunobu Doi, Makiko Tohgo, Katsuhiro Minoura & Atsushi Numata
J.Chem.Soc., Chem. Commun., 1321-1322 (1999)
X-Ray Data Summary
| formula | C28 H40 O3 | ||
| weight | 424.6 | ||
| symmetry | orthorhombic | ||
| space group | P212121 | ||
| Cell | Crystal | ||
| a | 12.667(3) Ang. | description | plate |
| b | 23.829(5) Ang. | colour | Colorless |
| c | 8.134(4) Ang. | size (mm) | 0.6x0.3x0.05 |
| alpha | 90 deg. | Dx (g/ml) | 1.149 |
| beta | 90 deg. | F(000) | 928 |
| gamma | 90 deg. | mu(CuKa) | 0.563 |
| volume | 2455.4(14) Ang^3 | ||
| Z | 4 | ||
| Diffrn measurement | Refinementspace | ||
| device type | Rigaku AFC5R/RU-200 | Flack | 0.0(6) |
| decay | -2.0 % | parameters | 286 |
| index limit | -5-h-15, -9-k-29, 0-L-9 | restraints | 0 |
| theta (deg.) | 3.71-70.14 | R_factor_gt | 0.0625 |
| total reflections | 3915 | wR_factor_gt | 0.1504 |
| reflections(obs) | 3467 .gt. 2sigma(I) | dela rho_max | 0.411 e A^3 |
| Structure | space space space space space space | delta rho_min | -0.383 e A^3 |
| solution | SHELXS-97 | shift/su_max | lt.0.001 |
| refinement | SHELXL-97 | Goodness of fit | 1.036 |
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