S-carboxymethyl-L-cysteine carboxymethyl cysteinyl 157.0309906005859375 157.1999969482421875 54.02179718017578125 54.049999237060546875 true C 2 H 2 N 2 MOD:01062 Carboxymethyl Cystenyl From DeltaMass:197 (Name misspelled "cystenyl", and formula incorrect, N and O reversed) Abbreviation:-Cmc- Formula:C5H7O1N3S1 Monoisotopic Mass Change:161.015 Average Mass Change:161.179 artifact none OBSOLETE because duplicate and redundant with MOD:01061. Remap to MOD:01061 PSI-MOD C 5 H 7 N 3 O 1 S 1 C