stereoisomerized residue 2-(L-cystein-S-yl)-D-asparagine (2S)-2,4-diamino-2-([(2R)-2-amino-2-carboxyethyl]sulfanyl)-4-oxobutanoic acid -2.0156500339508056641 -2.0199999809265136719 215.036468505859375 215.2299957275390625 A protein modification that effectively cross-links an L-cysteine residue and an L-asparagine residue by a thioether bond to form 2-(S-L-cysteinyl)-D-asparagine. C 0 H -2 N 0 O 0 S 0 C 7 H 9 N 3 O 3 S 1 C, N Cross-link 2. MOD:01985 PSI-MOD alpha-(L-cystein-S-yl)-D-asparagine natural alpha-carbon thioether crosslinked residues crosslinked D-asparagine residue