12-beta-Hydroxymarinobufagin 14,15-beta-Epoxy-3-beta,5,12-beta-trihydroxy-5-beta-bufa-20,22-dienolide 5-beta-Bufa-20,22-dienolide, 14,15-beta-epoxy-3-beta,5,12-beta-trihydroxy- EI2987000