作者:Jorge A. Palermo、María F.Rodríguez Brasco、Enrique A. Hughes、Alicia M. Seldes、Vilma T. Balzaretti、Eduardo Cabezas
DOI:10.1016/0039-128x(95)00167-o
日期:1996.1
The sterol composition of the Patagonian tunicate Polizoa opuntia was examined, and twenty-four compounds ,cere identified as having either a Delta(5), Delta(7), or Delta(0) nucleus. Two of them, the rare 20-methylpregn-5-en-3 beta-ol and 20-ethylpregn-5-en-3 beta-ol, were previously unreported as natural products from tunicates. These compounds were present only as trace components; therefore, their structures were confirmed by synthesis from suitnble precursors and by comparison of the spectral and chromatographic constants of the synthetic and natural compounds.