preferred_name: A[3'-5']pG[3'-5']pAp[3'] + H(+) => 3',3',3'-cAAG + H2O
preferred_name_lc: a[3'-5']pg[3'-5']pap[3'] + h(+) => 3',3',3'-caag + h2o
label: A[3'-5']pG[3'-5']pAp[3'] + H(+) => 3',3',3'-cAAG + H2O
label_lc: a[3'-5']pg[3'-5']pap[3'] + h(+) => 3',3',3'-caag + h2o