Using Nc1cc(Cl)cc(Cl)c1, CCOC(=O)C=CCC(=O)OCC to produce CCOC(=O)c1cc(C(=O)OCC)c2c(Cl)cc(Cl)cc2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.