label: N(5)-formyl-5,6,7,8-tetrahydromethanopterin + H(+) => 5,10-methenyl-5,6,7,8-tetrahydromethanopterin + H2O
label_lc: n(5)-formyl-5,6,7,8-tetrahydromethanopterin + h(+) => 5,10-methenyl-5,6,7,8-tetrahydromethanopterin + h2o