Using COC(=O)c1sc(C(=O)O)cc1Cl, NCc1cccc2[nH]ncc12 to produce COC(=O)c1sc(C(=O)NCc2cccc3[nH]ncc23)cc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.