You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Build a molecule that meets the requirement: The molecule is a btk inhibitor.
user
COCC#CC(=O)Nc1ccc2nccc(Oc3ccc(C(=O)Nc4cc(C#N)ccn4)cc3)c2c1
assistant