You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
I need a molecule that meets the following conditions: The molecule is a ret kinase inhibitor. Please represent the molecule in SMILES.
user
Cc1cc(Nc2cc(C#N)on2)nc(-c2ccc(C(=O)NC(C)c3ccc(-c4ccc(F)nc4C)nc3)nc2)n1
assistant