[{"from": "human", "value": "Describe this molecule. [C][C][Branch1][=C][C][=C][C][=C][C][=C][C][=C][Ring1][=Branch1][S][Ring1][=Branch2][N][Branch1][=Branch1][C][=Branch1][C][=O][N][O]"}, {"from": "gpt", "value": "The molecule is a synthetic derivative of hydroxyurea with antiasthmatic properties. The leukotriene inhibitor zileuton blocks 5-lipoxygenase, which catalyzes the formation of leukotrienes from arachidonic acid; causes bronchodilation; decreases bronchial mucous secretion and edema; and may prevent or decrease the symptoms of asthma. (NCI04)"}]