thioether crosslinked residues L-lanthionine (Cys-Cys) (2R,2'R)-3,3'-sulfanediylbis(2-aminopropanoic acid) (R)-S-(2-amino-2-carboxyethyl)-L-cysteine (R,R)-2,6-diamino-4-thiaheptanedioic acid (R,R)-3,3'-thiobis-(2-aminopropanoic acid) (R,R)-bis(2-amino-2-carboxyethyl)sulfide -33.987720489501953125 -34.0800018310546875 172.0306549072265625 172.1999969482421875 2-amino-3-(2-amino-2-carboxyethyl)sulfanylpropanoic acid 3,3'-thiobis-L-alanine A protein modification that effectively cross-links two L-cysteine residues with a thioether bond to form L-lanthionine. C 0 H -2 N 0 O 0 S -1 C 6 H 8 N 2 O 2 S 1 C, C Cross-link 2. L-lanthionine MOD:01837 PSI-MOD hypothetical