[{"from": "human", "value": "Describe this molecule. [C][C@@H1][Branch2][Ring1][Ring1][C][C][=Branch1][#Branch2][=N][C@@H1][Ring1][=Branch1][C][=Branch1][C][=O][O-1][C][=Branch1][C][=O][O-1][O]"}, {"from": "gpt", "value": "The molecule is the dicarboxylic acid dianion formed from (2S,4S)-4-hydroxy-2,3,4,5-tetrahydrodipicolinic acid by proton loss from both carboxy groups; major species present at pH 7.3. It is a conjugate base of a (2S,4S)-4-hydroxy-2,3,4,5-tetrahydrodipicolinic acid."}]