1097-51-4 16-alpha,17-Epoxypregn-4-ene-3,20-dione 16alpha,17-Epoxypregn-4-ene-3,20-dione 16alpha,17-Epoxyprogesterone EINECS 214-147-5 NSC 18315 Pregn-4-ene-3,20-dione, 16,17-epoxy-, (16-alpha)- Pregn-4-ene-3,20-dione, 16,17-epoxy-, (16alpha)- Pregn-4-ene-3,20-dione, 16-alpha,17-epoxy-