Abstract
A biosynthetic precursor 4 of the antitumor alkaloid camptothecin ( 1) has been isolated from alkaloid enriched extracts of Camptotheca acuminata. The structure of 4, which was determined both in the solid state by x-ray diffraction and in solution by NMR analysis, provides strong evidence in support of the proposed biosynthetic scheme for camptothecin ( 1).
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