label: phycoerythrobilin-L-cysteinyl(84)-[C-phycoerythrin beta-subunit] => apo-L-cysteinyl(84)-[C-phycoerythrin beta-subunit] + (2R,3E)-phycoerythrobilin
label_lc: phycoerythrobilin-l-cysteinyl(84)-[c-phycoerythrin beta-subunit] => apo-l-cysteinyl(84)-[c-phycoerythrin beta-subunit] + (2r,3e)-phycoerythrobilin