preferred_name: Guanine + H2O => Xanthine + NH4+ (Canis familiaris)
preferred_name_lc: guanine + h2o => xanthine + nh4+ (canis familiaris)
label: Guanine + H2O => Xanthine + NH4+ (Canis familiaris)
label_lc: guanine + h2o => xanthine + nh4+ (canis familiaris)