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 a btk inhibitor.
user
CNC(=O)N1CCC(c2ccc3c4cncc(C(N)=O)c4n(N4CCC(=O)C5(CCNC5)C4)c3c2)CC1
assistant