You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Conceptualize a molecule that meets the specified attribute(s): The molecule is a ret kinase inhibitor.
user
Cn1cc(-c2cc(-c3ccc(C4CCN(C(=O)O)C(C(C)(C)C)C4)cc3)c3c(C#N)cnn3c2)cn1
assistant