syndesine 16.955120086669921875 16.95999908447265625 273.145050048828125 273.30999755859375 A protein modification that effectively cross-links two L-lysine residues to form syndesine, hydroxylysinohydroxynorleucine. C 0 H -3 N -2 O 3 C 12 H 21 N 2 O 5 Cross-link 2; From DeltaMass: Average Mass: 13 Average Mass Change: 13 (incorrect) [JSG]. K, K MOD:00967 PSI-MOD hydroxylysinohydroxynorleucine crosslinked L-lysine residue