desmosterol + reduced [NADPH--hemoprotein reductase] + O2 = (24S)-25-epoxycholesterol + oxidized [NADPH--hemoprotein reductase] + H2O + H(+)
desmosterol + reduced [nadph--hemoprotein reductase] + o2 = (24s)-25-epoxycholesterol + oxidized [nadph--hemoprotein reductase] + h2o + h(+)
desmosterol + reduced [NADPH--hemoprotein reductase] + O2 = (24S)-25-epoxycholesterol + oxidized [NADPH--hemoprotein reductase] + H2O + H(+)
desmosterol + reduced [nadph--hemoprotein reductase] + o2 = (24s)-25-epoxycholesterol + oxidized [nadph--hemoprotein reductase] + h2o + h(+)