derives from deamidated L-asparagine 1x(18)O labeled deamidated residue 1x(18)O labeled deamidated L-asparagine 117.029998779296875 117.03118896484375 2.9882619380950927734 2.9900000095367431641 A protein modification that effectively converts an L-asparagine residue to L-aspartic acid with one (18)O. C 4 H 5 N 1 (16)O 2 (18)O 1 Deamidated:18O(1) Deamidation in presence of O18 H -1 N -1 (18)O 1 MOD:01293 N PSI-MOD Unimod:366 artifact oxy18