117550-12-6 D-Valine, L-tyrosyl-D-cysteinyl-L-phenylalanyl-3-mercapto-, cyclic (2-4)-disulfide DCFPE H-Tyr-cyclo(cys-phe-pen)-OH H-Tyrosyl-cyclo(cysteinyl-phenylalanyl-beta-beta-dimethylcysteinyl)-OH H-Tyrosyl-cyclo(cysteinyl-phenylalanyl-penicillaminyl)-OH Htdcpdp-OH Jom 13 Tyr-c(D-cys-phe-D-pen)OH