preferred_name: 4 porphobilinogen + H2O => hydroxymethylbilane + 4 NH4(+)
preferred_name_lc: 4 porphobilinogen + h2o => hydroxymethylbilane + 4 nh4(+)
label: 4 porphobilinogen + H2O => hydroxymethylbilane + 4 NH4(+)
label_lc: 4 porphobilinogen + h2o => hydroxymethylbilane + 4 nh4(+)