72903-48-1 Clggpc-CD Cys-leu-glu-glu-pro-cys cyclic disulfide Cysteinyl-leucyl-glutamyl-glutamyl-prolyl-cysteine cyclic disulfide L-Cysteine, L-cysteinyl-L-leucyl-L-alpha-glutamyl-L-alpha-glutamyl-L-prolyl-, cyclic (1-6)-disulfide