[{"from": "human", "value": "What can you tell me about this molecule? [C][C][=C][Branch2][Ring1][Ring1][C][=C][C][=C][Ring1][=Branch1][C][=Branch1][=Branch2][=N][C][=Branch1][Ring2][=N][Ring1][=Branch1][N][N][C][N][C][=C][C][=Branch1][=C][=C][Branch1][=Branch2][C][=Branch1][Ring2][=C][Ring1][=Branch1][O][C][O][C][O][C]"}, {"from": "gpt", "value": "The molecule is a parenterally administered folate antagonist that is used as a second line therapy for severe Pneumocystis jirovecii (previously carinii) pneumonia. Trimetrexate therapy has been associated with transient, mild serum enzyme elevations during therapy, but has not been convincingly linked to instances of acute, clinically apparent liver injury."}]