Asr. Anjaneyulu et Ss. Rao, A NEW KETOSTEROID FROM THE BARK OF COUROPITA-GUIANENSIS AUBL, Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 37(4), 1998, pp. 382-386
Chemical examination of the bark of Couropita guianensis Aubl. furnish
es a new ketosteroid, couropitone in addition to beta-amyrin, beta amy
rone, beta-amyrin acetate, stigmasterol, ergosta-4,6,8(14), 22-tetraen
-3-one, beta-sitosterol and its glyco-side. The structure of couropito
ne is established as stigmasta-4,23(E)-dien-3-one 1.