1,3,7-trimethylurate + NADH + O2 + H(+) <=> 1,3,7-trimethyl-5-hydroxyisourate + NAD(+) + H2O
1,3,7-trimethylurate + nadh + o2 + h(+) <=> 1,3,7-trimethyl-5-hydroxyisourate + nad(+) + h2o
1,3,7-trimethylurate + NADH + O2 + H(+) <=> 1,3,7-trimethyl-5-hydroxyisourate + NAD(+) + H2O
1,3,7-trimethylurate + nadh + o2 + h(+) <=> 1,3,7-trimethyl-5-hydroxyisourate + nad(+) + h2o