derives from S-carboxamidoethyl-L-cysteine S-([1,1,2-(2)H3]-carboxamidoethyl)-L-cysteine 177.06512451171875 177.07000732421875 74.05594635009765625 74.05999755859375 A protein modification that effectively converts an L-cysteine residue to S-(1,1,2-(2)H3)-propanamide-L-cysteine. Acrylamide d3 C C 3 (1)H 2 (2)H 3 N 1 O 1 C 6 (1)H 7 (2)H 3 N 2 O 2 S 1 MOD:00474 PSI-MOD Propionamide:2H(3) S-([1,1,2-(2)H3]-3-amino-3-oxopropyl)cysteine S-([1,1,2-(2)H3]-carbamoylethyl)-L-cysteine S-([1,1,2-(2)H3]-propanamide)-L-cysteine Unimod:97 artifact isotope tagged reagent derivatized residue