A new 5β-steroid disulfate (I), with a unique 4α,9α-ether bridge, was isolated from the ophiuroid O. annulosa, together with the minor related compd. (II) and the known compds. (III and IV). The structures of I and II were deduced mainly from FAB-MS and NMR data. The lowest energy conformation of the desulfated I, obtained by Mol. Mechanics calcns. in the force field MM2, completely agrees with the 1H-NMR data.
Isolation, structure characterization and conformational analysis of a unique 4α,9α-epoxysteroid sulfate from the Okinawan ophiuroid Ophiomastix annulosa
RICCIO, Raffaele;
1992-01-01
Abstract
A new 5β-steroid disulfate (I), with a unique 4α,9α-ether bridge, was isolated from the ophiuroid O. annulosa, together with the minor related compd. (II) and the known compds. (III and IV). The structures of I and II were deduced mainly from FAB-MS and NMR data. The lowest energy conformation of the desulfated I, obtained by Mol. Mechanics calcns. in the force field MM2, completely agrees with the 1H-NMR data.File in questo prodotto:
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