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
CC(C)(C)OC(=O)N1CC2C3C(n4nc(-c5cnn(Cc6cccc(C(F)F)c6)c5)c(C(N)=O)c4N)CC23C1
assistant