modified L-leucine residue 6x(13)C,1x(15)N labeled L-leucine (12)C -6 (13)C 6 (14)N -1 (15)N 1 (13)C 6 H 11 (15)N 1 O 1 120.09999847412109375 120.101226806640625 13C(6) 15N(1) Silac label 7.0171642303466796875 7.0199999809265136719 A protein modification that effectively converts an L-leucine residue to 6x(13)C,1x(15)N isotope labeled L-leucine. L Label:13C(6)15N(1) MOD:01285 PSI-MOD Unimod:695 artifact 6x(13)C,1x(15)N labeled residue