apo-L-cysteinyl(84)-[phycoerythrocyanin alpha-subunit] + (2R,3E)-phycocyanobilin => phycoviolobilin-L-cysteinyl(84)-[phycoerythrocyanin alpha-subunit]
apo-l-cysteinyl(84)-[phycoerythrocyanin alpha-subunit] + (2r,3e)-phycocyanobilin => phycoviolobilin-l-cysteinyl(84)-[phycoerythrocyanin alpha-subunit]