Using COCC(N)COC, CCOC(=O)C(=CN(C)C)C(=O)c1cc(Br)ncc1F to produce CCOC(=O)c1cn(C(COC)COC)c2cnc(Br)cc2c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.