Strictosidine (isovincoside): the key intermediate in the biosynthesis of monoterpenoid indole alkaloids

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Abstract
In contrast to previous assumptions the precursor of monoterpenoid Catharanthus alkaloids, which arises from the enzymatic condensation of tryptamine (I) and secologanin (II), is 3α(S)-strictosidine (isovincoside)(III) and not its 3β(R)-epimer vincoside (IV).