Abstract
Three new 4α-methyl steroids, 4α-methyl-ergost-7,24(28)-diene-3β-ol-23-one ( 1), 4α-methyl-ergost-8(14),24(28)-diene-3β-ol-23-one ( 2), 4α-methyl-ergost-24(28)-en-3β,11β-diol-23-one ( 3), and two new polyoxygenated steroids, ergost-5,25-diene-3β,24 S,28-triol ( 4), ergost-5,24(28)-diene-3β,23 S-diol ( 5), along with one known steroid 24-methylencholesterol ( 6) were isolated from the soft coral Nephthea sp. Their structures including the relative configurations were elucidated by extensive 1D and 2D NMR spectra analysis. The absolute configurations of ( 4) and ( 5) were determined by the Mosher's method.
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