28111-34-4 3-Acetylcevin 4,9-Epoxycevane-3-alpha,4-beta,12,14,16-beta,17,20-heptol 3-acetate Acetylcevin CEVANE-3-alpha,4-beta,12,14,16-beta,17,20-HEPTOL, 4,9-EPOXY-, 3-ACETATE