Seven new marine polyhydroxysteroids [I, R1 = R2 = H, OH; R3 = R4 = H, SO3H; R5 = CH2COEt, CH:C(Me)CH2OH, CH2CH(OH)Et] of which 4 have a 27-norcholestane skeleton, were isolated by droplet counter-current chromatog. and reversed-phase HPLC from A. typicus. Characterization was accomplished by fast-atom bombardment mass spectrometry and 1H and 13C NMR spectroscopy including 2-dimensional H-C chem.-shift correlation (direct and long range) NMR spectroscopy.
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