Chemical constituents of the stem bark of Bombax ceiba L.

Thirteen compounds were isolated from the stem bark of Bombax ceiba L. by silica gel, and Sephadex LH-20 column chromatography. Their structures were identified by spectroscopic analysis as: lupeol( 1 ), lupeone( 2 ), betulinic acid( 3 ), zeorin( 4 ), oleanolic acid( 5 ), 3-oxooleanolic acid( 6 ), cleomiscosin A( 7 ), (±)-lyoniresinol( 8 ), desmosterol( 9 ), stigma-3, 6-dione( 10 ), (+)-lasiodiploidin( 11 ), aurantiamide acetate( 12 ), and(2S, 3S, 4R, 10E)-2-［(2R)-2-hydroxytetracosanoylamino］-10-octadecene-1, 3, 4-triol( 13 ). Among them, compounds 3 , 4 , 6 , 7 - 13 were isolated from this plant for the first time.