In addition to the known compounds withanolide A ( 4 ), withanone ( 5 ), and NIC-3 ( 6 ), three 16-hydroxylated withanolides were isolated from Exodeconus maritimus . The new withanolides were identified as 6α,7α-epoxy-5α,16β-dihydroxy-1-oxowitha-2,17(20),24-trienolide (exodeconolide A, 1 ), 6α,7α-epoxy-5α,16α-dihydroxy-1-oxowitha-2,17(20),24-trienolide (exodeconolide B, 2 ), and 6α,7α-epoxy-5α,16α,17α-trihydroxy-1-oxowitha-2, 24-dienolide (exodeconolide C, 3 ), by a combination of spectroscopic (1D and 2D NMR, MS) and chemical methods with the aid of molecular modeling.
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Gil et al. (1997) studied this question.
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