taurocholate + L-histidine <=> L-histidocholate + taurine
taurocholate + l-histidine <=> l-histidocholate + taurine
taurocholate + L-histidine <=> L-histidocholate + taurine
taurocholate + l-histidine <=> l-histidocholate + taurine