1.14.13.43 additional information questin and 7-demethyl-neosulochrin are detected in strain FVL2, the latter is another isomer arising from ring cleavage between C-10/C-10a at the other side of the anthraquinone, forming the carboxylic group at ring A 1.14.13.43 questin + NADPH + H+ + O2 - 1.14.13.43 questin + NADPH + H+ + O2 absolute requirement for oxygen and NADPH