Abstract
Abstract It was first proved that the 20α-methyl group, as well as the 4β-, 8-, 10-, 14-, and 17-methyls of β-amyrin biosynthesized from [6-D3-mevalonic acid in Pisum sativum are stereospecifically derived from the 3-methyl group of the acid. The result has substantiated the stereospecificity in the enzymatic cyclization of squalene to β-amyrin.
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