You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
I give you a description of a molecule, and you need to return one molecule in SMILES that meets the description. The description: The molecule is a cb2 agonist and belongs to the cb1 antagonist class of molecules.
user
COCc1c(C(=O)NC2CCCCC2)nn(-c2ccc(Cl)cc2Cl)c1-c1ccc(Br)cc1
assistant