L-proline 5-hydroxyoxazole-4-carbothionic acid -4.0300002098083496094 -4.0313000679016113281 196.0306549072265625 196.2299957275390625 H -4 5-hydroxy-2-[(2S)-pyrrolidin-2-yl]-1,3-oxazole-4-carbothioic O-acid PSI-MOD CROSSLNK Proline 5-hydroxy-oxazole-4-carbothionic acid (Pro-Cys) L-proline 5-hydroxy-oxazole-4-carbothionic acid none MOD:01845 A protein modification that effectively converts an L-cysteine residue and an L-proline residue to L-proline 5-hydroxyoxazole-4-carbothionic acid. Cross-link 2. (4Z)-4-[hydroxy(sulfanyl)methylidene]-2-[(2S)-pyrrolidin-2-yl]-1,3-oxazol-5(4H)-one [tautomer] C, P C 8 H 8 N 2 O 2 S 1 natural oxazole/oxazoline ring crosslinked residues (Cys) crosslinked L-cysteine residue crosslinked L-proline residue