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The fate of the hydrogen atoms originating from 2-13C,2-2H3acetate was investigated in the biosynthesis of sitosterol (5) in cultured cells of Rabdosia japonica Hara and ergosterol (6) in yeast and the 1,2-hydride shifts, 20-H from C-17 and 17-H from C-13, were verified.
Seo et al. (Wed,) studied this question.