4029-68-9 5.beta.-Bufa-20,22-dienolide, 14,15.beta.-epoxy-3.beta.,5-dihydroxy-, 3-acetate Acetylmarinobufogenin Bufa-20,22-dienolide, 3-(acetyloxy)-14,15-epoxy-5-hydroxy-, (3.beta.,5.beta.,15.beta.)- NSC135687