Results of feeding experiments in Tylophora asthmatica with the 6,7-diphenylhexahydroindolizines (5), (8), and (10) allow definition of the biosynthesis of the phenanthroindolizidine alkaloids (13), (14), and (16) as being through (8), (10), and (12).
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Herbert et al. (1977) studied this question.
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