3,16-Diacetylcevin 4,9-Epoxycevane-3-alpha,4-beta,12,14,16-beta,17,20-heptol 3,16-diacetate Cevane-3-alpha,4-beta,12,14,16-beta,17,20-heptol, 4,9-epoxy-, 3,16-diacetate FL4914500