Using O=Cc1cc(OCc2c(-c3ccc(Cl)cc3)nsc2C(F)(F)F)ccc1Br, C=CC(=O)OC to produce COC(=O)/C=C/c1ccc(OCc2c(-c3ccc(Cl)cc3)nsc2C(F)(F)F)cc1C=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.