[{"from": "human", "value": "Describe this molecule. [C][C][=C][Branch1][=Branch1][C][=N][O][Ring1][Branch1][C][=Branch1][C][=O][N][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][C][Branch1][C][F][Branch1][C][F][F]"}, {"from": "gpt", "value": "The molecule is an immunomodulatory agent used in the therapy of rheumatoid arthritis and psoriatic arthritis. Leflunomide therapy is associated with frequent elevations in serum aminotransferase levels and with rare instances of clinically apparent acute liver injury which can be severe and even fatal."}]