(6R)-10-formyltetrahydrofolate + H(+) => (6R)-5,10-methenyltetrahydrofolate + H2O
(6r)-10-formyltetrahydrofolate + h(+) => (6r)-5,10-methenyltetrahydrofolate + h2o
(6R)-10-formyltetrahydrofolate + H(+) => (6R)-5,10-methenyltetrahydrofolate + H2O
(6r)-10-formyltetrahydrofolate + h(+) => (6r)-5,10-methenyltetrahydrofolate + h2o