16alpha,17-Dihydroxy-4-pregnen-3,20-dion 16alpha,17-Dihydroxypregn-4-ene-3,20-dione 595-77-7 ALGESTONE Algestona [INN-Spanish] Algestonum [INN-Latin] Alphasone EINECS 209-869-2 Pregn-4-ene-3,20-dione, 16,17-dihydroxy-, (16alpha)-