You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Build a molecule that meets the requirement: The molecule is a crth2 antagonist, asthma treatment, anti allergic, and anti allergic agent.
user
Cc1cccc(CCCCN2C=C(C(c3ccccc3)c3ccccc3)C=CC2)c1
assistant