Structure of dregeanin and rohitukin, limonoids from the subfamily Melioideae of the family Meliaceae. An unusually high absorption frequency for a six-membered lactone ring

Abstract
A new group of limonoids, characterised by the possession of a seven-membered lactone ring A, a secoring B, and a five-membered carbocyclic ring D, has been discovered in the sub-family Meliodieae; a C(1)-C(7) lactone occurring in certain of these is characterised by an unusually high frequency carbonyl absorption in the i.r. spectra.

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