thiazole/thiazoline ring crosslinked residues L-arginine thiazole-4-carboxylic acid -20.026214599609375 -20.030000686645507812 239.084075927734375 239.3000030517578125 H -4 O -1 CROSSLNK Thiazole-4-carboxylic acid (Arg-Cys) natural C 9 H 13 N 5 O 1 S 1 L-arginine thiazole-4-carboxylic acid 2-[(1S)-1-amino-4-([diaminomethylidene]amino)butyl]-1,3-thiazole-4-carboxylic acid MOD:01899 PSI-MOD none A protein modification that effectively crosslinks an L-arginine residue and an L-cysteine residue to form arginine thiazole-4-carboxylic acid. Cross-link 2. C, R crosslinked L-arginine residue didehydrogenated and dehydrated residue