label: N(5)-(L-ornithyl)-[N(5)-(L-ornithyl)]n-1 + n AMP + n diphosphate + n H(+) => n L-ornithine + n ATP + H2O
label_lc: n(5)-(l-ornithyl)-[n(5)-(l-ornithyl)]n-1 + n amp + n diphosphate + n h(+) => n l-ornithine + n atp + h2o