Using CCC(C(=O)OC)(c1ccc(Cl)cc1)n1ncc2c(NC(=O)OC(C)(C)C)cccc21 to produce CCC(C(=O)OC)(c1ccc(Cl)cc1)n1ncc2c(N)cccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.