preferred_name: taurocholate + L-histidine <=> L-histidocholate + taurine
preferred_name_lc: taurocholate + l-histidine <=> l-histidocholate + taurine
label: taurocholate + L-histidine <=> L-histidocholate + taurine
label_lc: taurocholate + l-histidine <=> l-histidocholate + taurine