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■ Isonimolide and Isolimbolide, Two New Tetranortriterpenoids from the Twigs of Azadirachta indica A.Juss (Meliaceae)

Salimuzzaman Siddiqui, Tariq Mahmood, Bina Shaheen Siddiqui, and Shaheen Faizi

*H. E. J. Postgraduate Institute of Chemistry, University of Karachi, Karachi-75270, Pakistan

Abstract

Two new tetranortriterpenoid γ-hydroxybutenolides named as isonimolide and isolimbolide along with isonimocinolide, have been isolated from the acidic fraction of the fresh, undried, spring twigs of Azadirachta indica (neem). The structures of these limonoids have been established through chemical and spectral studies.