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  • Title: Tetracyclic triterpenoids from the leaves of Azadirachta indica.
    Author: Siddiqui BS, Afshan F, Gulzar T, Hanif M.
    Journal: Phytochemistry; 2004 Aug; 65(16):2363-7. PubMed ID: 15381008.
    Abstract:
    Two new tetracyclic triterpenoids zafaral [24,25,26,27-tetranorapotirucalla-(apoeupha)-6alpha-methoxy-7alpha-acetoxy-1,14-dien-3,16-dione-21-al] (1) and meliacinanhydride [24,25,26,27-tetranorapotirucalla-(apoeupha)-6alpha-hydroxy,11alpha-methoxy-7alpha,12alpha-diacetoxy,1,14,20(22)-trien-3-one] (2) have been isolated from the methanolic extract of neem leaves along with two known constituents nimocinol and isomeldenin. Their structures and the relative configurations were determined by spectroscopic methods ((1)H and (13)C NMR, IR, and MS) and 2D NMR experiments.
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