Eight polyhydroxylated sterols, 7 of them novel, were isolated from the hepatopancreas of the scallop P. yessoensis. Compds. I-VII possessed the same Δ7-3β,5α,6β-triol nucleus but differed in the side chains. One very minor component VIII had an addnl. OH group at C-9α. Their structures were deduced from 1H and 13C NMR and mass spectral data and by comparison with synthetic model compds.
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