| Numata 134-VII-Ac-1
Absolute stereostructures of novel cytotoxic metabolites, gymnastatins A-E, from a Gymnascella species separated from a Halichondria sponge Amagata,T., Doi,M., Ohta,T., Minoura,K. and Numata,A. (1998) J. Chem. Soc., Perkin Trans. 1, 3585-3599. |
 This structer was produced by RasMol, and stucked by GifBuilder (Yves Piguet, 1997) |
ORTEP-III (Burnett, 1996) drawing
Introduction: Based on the fact that some of the bioactive materials isolated from marine animals have been produced by bacteria, we have focused our attention on new antitumor materials from microorganisms inhabiting the marine environment. As part of this program, we have found a number of antituimor and/or cytotoxic compounds from various fungi and an actinomycete originally isolated from various marine organisms, and elucidated their structure. Our continuing search for cytotoxic compounds has led to the isolation of five metablites designated gymnastatins A-E 1-5 from a strain of Gymnascella dankaliensis (Castellani) Currah OUPS-N134 which was separated from the spoge Halichonadria japonica. We report herein the isolation and absilute stereostructure determination of 1-5, of which the relative seterostructures for 1-3 except for in a preliminary form, together with their cytotoxic activies.
X-Ray Data Summary
| formula | C27 H37 Cl N O7 | ||
| weight | 523.03 | ||
| symmetry | monoclinic | ||
| space group | C2 | ||
| Cell | Crystal | ||
| a | 19.175(7) Ang. | description | plate/td> |
| b | 9.322(3) Ang. | colour | Colorless |
| c | 17.751(4) Ang. | size (mm) | 0.8x0.4x0.05 |
| alpha | 90. deg. | Dx (g/ml) | 1.124 |
| beta | 103.00(2) deg. | F(000) | 1116 |
| gamma | 90. deg. | mu(CuKa) | 1.422 |
| volume | 3091.8(15) Ang^3 | ||
| Z | 4 | ||
| Refinement | Diffrn measurement | ||
| Flack | 0.00(4) | device type | Rigaku AFC5R/RU-200 |
| parameters | 331 | decay | -7.2 % |
| restraints | 1 | index limit | -22-h-0,0-k-10,-20-L-20 |
| R_factor_all | 0.0927 | theta (deg.) | 4.73 - 63.29 |
| R_factor_gt | 0.0882 | total reflections | 2670 |
| wR_factor_ref | 0.2365 | reflections(obs) | 2557 .gt. 2sigma(I) |
| wR_factor_gt | 0.2259 | Structure | |
| shift/su_max | lt.0.001 | solution | SHELXS-97 |
| shift/su_mean | 0.000 | refinement | SHELXL-97 |
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Date: Feb.1998