You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Give me a molecule that satisfies the conditions outlined in the description: The molecule is a asthma treatment and belongs to the crth2 antagonist class of molecules.
user
O=C(O)CCn1ncc2c1CCCC2NS(=O)c1ccc(-c2ccccc2)cc1
assistant