Abstract
The recent discovery of four steroid acids in a California petroleum is described. The observed ratios of cisto trans-stercoisomers of the A/B rings of the steroid skeleton justify postulation of some animal contribution to the origin of this petroleum. Mechanisms of formation from animal bile acids and unsaturated sterols are discussed. The conclusions are that all steroid acid isomers found can be explained from animal sources. Plant sources are likely contributors; however, they alone cannot explain all the isomers in their observed ratios.
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