Acta Crystallographica Section C

Crystal Structure Communications

Volume 59, Part 8 (August 2003)

Acta Cryst. (2003). C59, o416-o418 [doi:10.1107/S0108270103011983]

Samaderin B and C from Samadera indica

R. Malathi, S. S. Rajan, G. Suresh, G. N. Krishnakumari and G. Gopalakrishnan

Abstract: Samaderin B, or (1R,2S,5R,5aR,7aS,11S,11aS,11bR,14S)-1,7,7a,11,11a,11b-hexahydro-1,11-dihydroxy-8,11a,14-trimethyl-2H-5a,2,5-(methanoxymetheno)naphth[1,2-d]oxepine-4,6,10(5H)-trione, C₁₉H₂₂O₇, and samaderin C, or (1R,2S,5R,5aR,7aS,10S,11S,11aS,11bR,14S)-7,7a,10,11,11a,11b-hexahydro-1,10,11-trihydroxy-8,11a,14-trimethyl-2H-5a,2,5-(methanoxymetheno)naphth[1,2-d]oxepine-4,6(1H,5H)-dione, C₁₉H₂₄O₇, were isolated from the seed kernels of Samadera indica and were shown to exhibit antifeedant activity against Spodoptera litura third-instar larvae. The replacement of the carbonyl group in samaderin B by a hydroxy group in samaderin C causes conformational changes at the substitution site, but the overall conformation is not affected; however, the compounds pack differently in the crystal lattice.

Formula: C₁₉H₂₂O₇ and C₁₉H₂₄O₇

Online 12 July 2003


	Structure factor file (CIF format) (85.8 kbytes) Contains datablock I

	Structure factor file (CIF format) (90.9 kbytes) Contains datablock II

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