N6-acylated L-lysine N6-((3R)-3-hydroxybutanoyl)-L-lysine 214.131744384765625 214.2599945068359375 86.03678131103515625 86.089996337890625 K MOD:02094 A protein modification that effectively converts an L-lysine residue to N6-((3R)-3-hydroxybutanoyl)-L-lysine. none C 10 H 18 N 2 O 3 natural MOD_RES N6-(beta-hydroxybutyryl)lysine C 4 H 6 O 2 PSI-MOD