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 jak3 inhibitor.
user
CC1CN(C(O)C2(C#N)CC2)CC1Nc1c(C(N)=O)cnn2cc(Br)nc12
assistant