19-Norlanosta-5,23-diene-3,11,22-trione, 25-(acetyloxy)-2,16,20-trihydroxy-9-methyl-, (2.beta.,9.beta.,10.alpha.,16.alpha.,23E)- 19-Norlanosta-5,23-diene-3,11,22-trione, 25-(acetyloxy)-2,16,20-trihydroxy-9-methyl-, [2.beta.,.gamma.,.beta.,10.alpha.,16.alpha.]- 19-nor-9.beta.,10.alpha.-Lanosta-5,23-diene-3,11,22-trione, 9-methyl-2.beta.,16.alpha.,20,25-tetrahydroxy-, 25-acetate 6199-67-3 CUCURBITACIN B Cucurbitacine (B) Datisca principle B Datiscn Principle B NSC49451