You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Suppose there is a molecule that meets the following description: The molecule is a ret kinase inhibitor and is cancer treatment. Please write the SMILES representation of it.
user
Cn1cc(-c2cn3ncc(C#N)c3c(-c3ccc(N4CCC(O)(Cc5ccccc5)CC4)nc3)n2)cn1
assistant