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
Nc1ncnc2c1c(-c1ccc(Oc3c(F)c(F)cc(F)c3F)cc1F)nn2CCN1C(=O)C=CC1O
assistant