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
Nc1nccn2c(C3CC4CCC3N4C(=O)OCc3ccccc3)nc(-c3ccc(C(=O)Nc4ccccn4)cc3)c12
assistant