Abstract
Chukvelutilides A–F ( 1- 6), a new class of C-15-acyl phragmalin type limonoids, featuring a C-16/C-30 δ-lactone ring, were isolated from Chukrasia tabularis var. velutina. These compounds are suggested to possess a three- or four-carbon enolized acyl substituent at C-15 through a plausible biosynthetic origin. Their structures were elucidated by extensive spectroscopic means, and that of 1 was confirmed by single-crystal X-ray diffraction.
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