S-carboxamidoethyl-L-cysteine acrylamidyl cysteinyl 174.046295166015625 174.220001220703125 71.03711700439453125 71.0800018310546875 true From DeltaMass: (name misspelled "Acrylamidyl Cystenyl") Average Mass: 174 Formula: C6H10O2N2S1 Monoisotopic Mass Change: 174.046 Average Mass Change: 174.221 MOD:01080 artifact C OBSOLETE because this is identical to MOD:00417. modification from DeltaMass C 3 H 5 N 1 O 1 Acrylamidyl Cystenyl C 6 H 10 N 2 O 2 S 1 PSI-MOD