5'-O-phosphonoguanyl-(2'->5')-adenosine + H2O <=> GMP + AMP + H(+)
5'-o-phosphonoguanyl-(2'->5')-adenosine + h2o <=> gmp + amp + h(+)
5'-O-phosphonoguanyl-(2'->5')-adenosine + H2O <=> GMP + AMP + H(+)
5'-o-phosphonoguanyl-(2'->5')-adenosine + h2o <=> gmp + amp + h(+)