You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Build a molecule that meets the requirement: The molecule is a ret kinase inhibitor.
user
C=NC(=CC=C(C)c1cc(OCC)cn2ncc(C#N)c12)N1CCC(CN(C)C)(NC(=O)CC2(OC)CC2)CC1
assistant