The isolation and structure of 13,18-dehydroglaucarubinone, a new antineoplastic quassinoid fromSimarouba amara

Abstract
An investigation of the Guyana plantSimarouba amara Aubl. (Simaroubaceae) for antineoplastic quassinoids led to isolation and structural determination of the new quassinoids 2′-acetylglaucarubine (1a) and 13,18-dehydroglaucarubinone (2). The previously known 2′-acetylglaucarubinone (3a) and glaucarubinone (3b) were also obtained. The new quassinoid2 was found significantly to inhibit growth of the murine lymphocytic leukemia P388.