label: 4-hydroxy-6-methylpretetramide + NADPH + O2 = 4-dedimethylamino-4-oxo-anhydrotetracycline + NADP(+) + H2O
label_lc: 4-hydroxy-6-methylpretetramide + nadph + o2 = 4-dedimethylamino-4-oxo-anhydrotetracycline + nadp(+) + h2o