20987-24-0 5.beta.-Bufa-20,22-dienolide, 14,15.beta.-epoxy-3.beta.-hydroxy-19-oxo- Bufa-20,22-dienolide, 14,15-epoxy-3-hydroxy-19-oxo-, (3.beta.,5.beta.,15.beta.)- NSC234206 RESIBUFAGIN