2,5-dimethylpyrrole lysine from 2,5-hexanedione adduct (2S)-2-amino-6-(2,5-dimethylpyrrolidin-1-yl)hexanoic acid 2,5-dimethypyrrole 206.14190673828125 206.2899932861328125 6-(2,5-dimethylpyrrolidin-1-yl)norleucine 78.0469512939453125 78.1100006103515625 C 12 H 18 N 2 O 1 C 6 H 6 DimethylpyrroleAdduct K MOD:00627 PSI-MOD There is no citation for this Unimod entry. Add PubMed:7981420, correct spelling [JSG]. Unimod:316 artifact modification from Unimod Chemical derivative reagent derivatized residue modified L-lysine residue