Using O=C(CCCl)c1ccccc1, CC(C)(C)OC(=O)NNC(=O)OC(C)(C)C to produce CC(C)(C)OC(=O)NN(CCC(=O)c1ccccc1)C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.