Steroid alcohols from the ascidianHalocynthia aurantium

The total sterols have been isolated fromHalocynthia aurantium by column chromatography on silica gel. The following steroid alcohols have been identified in it with the aid of GLC, GLC-MS, and¹H NMR: 5-cholestan-3-ol, 24-methylcholestan-3-ol, 24-ethylcholestan-3-ol, 4-methyl-24-ethyl-5-cholestan-3-ol, cholest-5-en-3-ol, 24-methylcholest-5-en-3-ol, 24-ethylcholes-5-en-3-ol, 5-cholest-22-en-3-ol, 24-nor-5-cholest-22-en-3-ol, cholesta-5,22-dien-3-ol, 24-methylcholesta-5,22-dien-3-ol, 24-norcholesta-5,22-dien-3-ol, 24-ethylcholesta-5,24(28)-dien-3-ol, and 24-methylcholesta-5,24(28)-dien-3-ol.Pacific Ocean Institute of Bioorganic Chemistry of the Far Eastern Scientific Center of the Academy of Sciences of the USSR, Vladivostok, and Far-Eastern State University, Vladivostok. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 581–585, September–October, 1981.