[{"from": "human", "value": "Provide a description of this molecule. [C][=C][C][=Branch2][Ring1][O][=C][C][=C][Ring1][=Branch1][C][C][C][=C][N][C][=C][Ring1][Branch1][C][=Branch1][C][=O][N][C][=Branch1][Ring2][=N][Ring1][#Branch1][N][C][=Branch1][C][=O][N][C@@H1][Branch1][Branch2][C][C][C][=Branch1][C][=O][O-1][C][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is a dicarboxylic acid dianion obtained by deprotonation of both carboxy groups of pemetrexed. It is a dicarboxylic acid dianion and a N-acyl-L-alpha-amino acid anion. It is a conjugate base of a pemetrexed."}]