[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][C][N][Branch2][Ring1][Ring2][C][Branch1][N][C][Branch1][Ring2][N][Ring1][=Branch1][C][=Branch1][C][=O][O][C][=Branch1][C][=O][O][C][=Branch1][C][=O][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][C][=C][C][=C][C][=C][Ring1][=Branch1][C][=C][Ring1][N]"}, {"from": "gpt", "value": "The molecule is a 1-(phenanthren-2-ylcarbonyl)piperazine-2,3-dicarboxylic acid that has 2R,3S-configuration. It has a role as a NMDA receptor antagonist. It is an enantiomer of a (2S,3R)-PPDA."}]