Abstract
Sterols of annelida of the class Polychaeta, Pseudopotamilla occelata MOORE, were identified as 22-trans-24-norcholesta-5, 22-dien-3β-ol (4.4%), 22-trans-cholesta-5, 22-dien-3β-ol (6%), cholesterol (50.1%), brassicasterol (5.5%), desmosterol (17.9%), 24-methylcholest-5-en-3β-ol (3.4%), 24-methylenecholest-5-en-3β-ol (9.3%), 24-ethylcholesta-5, 22-dien-3β-ol (0.5%), and 24-ethyl-and-ethylidene-chloest-5-en-3β-ol (total 2%). The major six sterols were isolated and their structure characterized. Gas-iquid chromatography showed the probable presence of 22-cis-isomer of cholesta-5, 22-dien-3β-ol.
