Ecdysone 20-monooxygenase is an enzyme that catalyzes the chemical reaction ecdysone + AH2 + O2 ⇌ {\displaystyle \rightleftharpoons } 20-hydroxyecdysone + A + H2OThe three substrates of this enzyme are ecdysone, an electron acceptor AH2, and O2, whereas its three products are 20-hydroxyecdysone, the reduction product A, and H2O. Wikipedia