ID 1.14.13.43 DE Questin monooxygenase. AN Questin oxygenase. CA Questin + NADPH + O(2) = demethylsulochrin + NADP(+) + H(2)O. CC -!- The enzyme cleaves the anthraquinone ring of questin to form a CC benzophenone. CC -!- Involved in the biosynthesis of the seco-anthraquinone (+)-geodin. //