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 tubulin inhibitor. Please represent the molecule in SMILES.
user
Cc1cccc(CCC(=O)Nc2ncc(Cc3ccc(F)c(F)c3)s2)c1
assistant