Using ClC(Cl)(Cl)Cl, CC1Cc2c(nc[nH]c2=O)CN1C(=O)OC(C)(C)C to produce CC1Cc2c(Cl)ncnc2CN1C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.