[{"from": "human", "value": "Describe this molecule. [C][Branch1][Ring1][C][S][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a mercaptopropanoic acid that is propanoic acid carrying a sulfanyl group at position 3. It has a role as an algal metabolite. It is a conjugate acid of a 3-mercaptopropionate."}]