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