Biosynthesis of terpenes and steroids. Part X. The sterols of some yeast mutants doubly defective in ergosterol biosynthesis

Abstract
The sterols of six double mutants of Saccharomyces cerevisiae have been isolated and characterised, and the sterol distribution has been related to the biosynthetic pathway from zymosterol to ergosterol. Hitherto unknown ergosta-5,8-dien-3β-ol and cholesta-7,24-dien-3β-ol have been isolated and characterised.