[{"from": "human", "value": "What can you tell me about this molecule? [C][C][Branch1][N][C][=Branch1][C][=O][N][C][C][=Branch1][C][=O][O][S]"}, {"from": "gpt", "value": "The molecule is an acylated sulfhydryl-containing derivative of glycine with reducing and complexing properties. Tiopronin breaks the disulphide bond of cystine and binds the sulfhydryl group of the resultant cysteine monomers to form a soluble tiopronin-cysteine-mixed disulfide, which is more water-soluble than cystine and is readily excreted. This leads to a reduction in urinary cystine concentration and subsequently reduces cystine stone formation."}]