You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Suppose there is a molecule that meets the following description: The molecule is a crth2 antagonist and is asthma treatment. Please write the SMILES representation of it.
user
O=C(O)Cc1c2c(n3ccccc13)CC(n1nncc1Cc1ccc(F)cc1F)CC2
assistant