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 belongs to the proliferative disease treatment class of molecules. Please write the SMILES representation of it.
user
COc1cc(-c2cnc(N3CCC(C)(NC(=O)O)CC3)cn2)c2c(C#N)cnn2c1
assistant