Surprisingly, the aporphine alkaloids (1), (2), and (3) of Dicentra eximia have been shown by tracer experiments to be derived from norprotosinomenine (25), presumably via the dienones (28) and (29).
A. R. Battersby, J. L. McHugh, J. Staunton and M. Todd, J. Chem. Soc. D, 1971, 985 DOI: 10.1039/C29710000985
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