Using COCC1CN(C(=O)OC(C)(C)C)C(OC)C(c2ccc3ccccc3c2)C1c1ccc(Br)cc1, CO to produce COCC1CN(OC)CC(c2ccc3ccccc3c2)C1c1ccc(Br)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.