S-3-[(2R)-phycoviolobilin]-L-cysteine(2-) residue
s-3-[(2r)-phycoviolobilin]-l-cysteine(2-) residue
An organic anionic group obtained by deprotonation of the carboxy groups of <em>S</em>-3-[(2<i>R</i>)-phycoviolobilin]-<small>L</small>-cysteine residue; major species at pH 7.3.