You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
I give you a description of a molecule, and you need to return one molecule in SMILES that meets the description. The description: The molecule is anti allergic.
user
CCCc1c(O)c(C(C)=NC)cc2c(NC)cc(C(=O)NC)nc12
assistant