24158-21-2 3,4-Diacetylcevin 4,9-Epoxycevane-3-alpha,4-beta,12,14,16-beta,17,20-heptol 3,4-diacetate CEVANE-3-alpha,4-beta,12,14,16-beta,17,20-HEPTOL, 4,9-EPOXY-, 3,4-DIACETATE