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 based on this description: The molecule is a btk inhibitor.
user
CCCc1ccnc(NC(=O)c2ccc(-c3nn(C4CCCN(C(=O)C=CCN(C)C5CC5)C4)c4ncnc(N)c34)cc2)c1
assistant