pregna-4,9(11)-diene-3,20-dione + AH2 + O2 => 9,11alpha-epoxypregn-4-ene-3,20-dione + A + H2O
pregna-4,9(11)-diene-3,20-dione + ah2 + o2 => 9,11alpha-epoxypregn-4-ene-3,20-dione + a + h2o
pregna-4,9(11)-diene-3,20-dione + AH2 + O2 => 9,11alpha-epoxypregn-4-ene-3,20-dione + A + H2O
pregna-4,9(11)-diene-3,20-dione + ah2 + o2 => 9,11alpha-epoxypregn-4-ene-3,20-dione + a + h2o