Using BrCCOCCBr, Cc1nc2c(CN)cc(Cl)nn2c1C(=O)c1ccc(Cl)cc1F to produce Cc1nc2c(CN3CCOCC3)cc(Cl)nn2c1C(=O)c1ccc(Cl)cc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.