Using OCc1ncc(-c2ccc(Cl)c(Cl)c2)s1, CCOC(=O)c1cn[nH]c1 to produce CCOC(=O)c1cnn(Cc2ncc(-c3ccc(Cl)c(Cl)c3)s2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.