[{"from": "human", "value": "Describe this molecule. [C][C][Branch2][Branch1][#Branch1][C@@H1][Branch2][Ring1][S][N][C@H1][Branch1][Ring2][S][Ring1][Branch1][C@@H1][Branch1][Branch1][C][Ring1][Branch1][=O][N][C][=Branch1][C][=O][C@@H1][Branch1][=Branch2][C][=C][C][=C][C][=C][Ring1][=Branch1][N][C][=Branch1][C][=O][O][C][O][C][=Branch1][C][=O][C][Branch1][C][C][Branch1][C][C][C][C]"}, {"from": "gpt", "value": "The molecule is a penicillanic acid ester that is the pivaloyloxymethyl ester of ampicillin. It is a prodrug of ampicillin. It has a role as a prodrug. It is a penicillanic acid ester and a pivaloyloxymethyl ester. It is functionally related to an ampicillin."}]