DeltaMass S-(sn-1-glyceryl)-L-cysteine 177.04595947265625 177.220001220703125 74.03678131103515625 74.0800018310546875 C C 3 H 6 O 2 C 6 H 11 N 1 O 3 S 1 From DeltaMass: Average Mass: 74 with no citation. MOD:00991 PSI-MOD artifact modification from DeltaMass