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 kras g12c inhibitor and belongs to the cancer treatment class of molecules.
user
Cc1cccc2cccc(N3CCCc4c(nc(OCCN5CCC(F)(F)CC5)nc4N4CCN(C(=O)OC(C)(C)C)C(CC#N)C4)C3)c12
assistant