A new trinortriterpene, meliacinolactol (1), and two new tetranortriterpenes, limocin C (2) and limocin D (3), along with a known constituent, azadiradionolide, were isolated from the fresh fruit coats of Azadirachta indica and were characterized by chemical transformation and spectroscopic experiments, including 2D-NMR techniques.
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Siddiqui et al. (2001) studied this question.