Using CCOC(=O)c1cc2c([nH]1)CCN(C(=O)OC(C)(C)C)C2 to produce CC(C)(C)OC(=O)N1CCc2[nH]c(C(=O)O)cc2C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.