You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Generate a molecule that fulfills the requirement: The molecule is a btk inhibitor.
user
O=C(c1ccccc1Cl)c1c[nH]c2ncnc(NC3CCC(C(=O)NCCc4cccnc4)CC3)c12
assistant