In enzymology, an isoquinoline 1-oxidoreductase is an enzyme that catalyzes the chemical reaction isoquinoline + acceptor + H2O ⇌ {\displaystyle \rightleftharpoons } isoquinolin-1-one + reduced acceptorThe 3 substrates of this enzyme are isoquinoline, acceptor, and H2O, whereas its two products are isoquinolin-1-one and reduced acceptor. Wikipedia