Isolation of a New Tetranortrietrpenoid from Azadirachta indica A, Juss (Meliaceae)

Abstract
A new .gamma.-hydroxybutenolide tetranortrierpenoid named as isonimbocinolide has been isolated from the acidic fraction of the fresh, undried leaves of Azadirachta indica A. Juss (neem) and its structure established through chemical and spectral studies. This fraction showed insect growth regulating properties against mosquitoes (Aedes aegypti).
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