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(+)