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 inhibitor.
user
CC1CN2C3=NC4OC(C)c5ccccc5N4c4cc(-c5c(N)cccc5F)cc(c43)OCC2CN1
assistant