A[3'-5']pA[3'-5']pAp[3'] + H(+) => 3',3',3'-c-tri-AMP + H2O
a[3'-5']pa[3'-5']pap[3'] + h(+) => 3',3',3'-c-tri-amp + h2o
A[3'-5']pA[3'-5']pAp[3'] + H(+) => 3',3',3'-c-tri-AMP + H2O
a[3'-5']pa[3'-5']pap[3'] + h(+) => 3',3',3'-c-tri-amp + h2o