Abstract
From the EtOH extract of the coats of fresh, undried, uncrushed, ripe fruits of neem, Azadirachta indica, a new tetracyclic triterpenoid azadirol and a known triterpenoid, kulactone, hitherto unreported from neem, have been isolated. Their structures have been elucidated through spectroscopic methods and chemical transformations. Azadirol is the first naturally occurring apotirucallol (apoeuphol) derivative with the C-8 side chain uncyclized and represents an immediate intermediate in the biosynthesis from tirucallol (euphol) of apotirucallol (apoeuphol) triterpenoids with a degraded or cyclized side chain
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