derives from 2x(13)C,6x(2)H labeled dimethylated L-arginine (12)C 6 (13)C 2 (1)H 10 (2)H 6 N 4 O 1 (13)C 2 (1)H -2 (2)H 6 192.176788330078125 192.17999267578125 36.0756683349609375 36.0800018310546875 A protein modification that effectively replaces two hydrogen atoms of an L-arginine residue with two (13)C,3x(2)H labeled methyl groups to form a 2x(13)C,6x(2)H labeled dimethylated L-arginine. Dimethyl:2H(6)13C(2) MOD:00638 PSI-MOD R Unimod:330 artifact dimethylated arginine dimethylated L-arginine (2)H deuterium labeled residue (13)C labeled residue modified L-arginine residue