[{"from": "human", "value": "Describe this molecule. [C][C][=C][C][=C][N][C][Ring1][=Branch1][=N][C][=C][Branch1][Branch1][C][Ring1][=Branch1][=O][C][=N][N][N][=N][Ring1][Branch1]"}, {"from": "gpt", "value": "The molecule is a slightly yellow powder that is soluble in water. It is a mast cell stabilizer that acts as an antiallergic agent. As an ophthalmic aqueous sterile solution, pemirolast is used for the prevention of itching of the eyes caused by allergies such as hay fever, and allergic conjunctivitis. Pemirolast is potentially useful for prophylaxis of pulmonary hypersensitivity reactions to drugs such as paclitaxel."}]