ID 1.14.13.62 DE 4-hydroxyquinoline 3-monooxygenase. AN 1-H-4-oxoquinoline 3-monooxygenase. AN Quinolin-4(1H)-one 3-monooxygenase. CA Quinolin-4-ol + NADH + O(2) = quinolin-3,4-diol + NAD(+) + H(2)O. CC -!- Quinolin-4-ol exists largely as the quinolin-4(1H)-one tautomer. //