124505-88-0 Cys-mal L-Cysteine, S-(1-(((2,5-dihydro-2,5-dioxo-1H-pyrrol-1-yl)methoxy)methyl)-2,5-dioxo-3-pyrrolidinyl)- S-(1-(((2,5-Dihydro-2,5-dioxo-1H-pyrrol-1-yl)methoxy)methyl)-2,5-dioxo-3-pyrrolidinyl)-L-cysteine S-(Bismaleimidoethyl ether)cysteine