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 cystic fibrosis treatment and belongs to the cftr modulator class of molecules.
user
Cc1cc(NC(C)C=CN)c(C(C)(C)C)cc1C(C)(C)C
assistant