a ribonucleoside 3'-phosphate-2'-3'-cyclophospho-GMP + H2O <=> a ribonucleoside 3'-phosphate + 2',3'-cyclophospho-GMP + H(+)
a ribonucleoside 3'-phosphate-2'-3'-cyclophospho-gmp + h2o <=> a ribonucleoside 3'-phosphate + 2',3'-cyclophospho-gmp + h(+)