preferred_name: Guanine + H2O => Xanthine + NH4+ (Rattus norvegicus)
preferred_name_lc: guanine + h2o => xanthine + nh4+ (rattus norvegicus)
label: Guanine + H2O => Xanthine + NH4+ (Rattus norvegicus)
label_lc: guanine + h2o => xanthine + nh4+ (rattus norvegicus)