androst-4-ene-3,17-dione + AH2 + O2 = testololactone + A + H2O
androst-4-ene-3,17-dione + ah2 + o2 = testololactone + a + h2o
"androst-4-ene-3,17-dione monooxygenase"
"androst-4-ene-3,17-dione monooxygenase"