obsolete peptide cross-linking via L-cysteinyl-5-imidazolinone glycine (obsolete GO:0050745)
OBSOLETE. The formation of a protein active site cross-link from the alpha-carboxyl carbon of residue N, a cysteine, to the alpha-amino nitrogen of residue N+2, a glycine, coupled with the formation of a double bond to the alpha-amino nitrogen of residue N+1 which loses one hydrogen, and the loss of a molecule of water.