Using O=C([O-])[O-], CC(C)(C)NCC(O)COc1ccc(N)cc1C(=O)CCC(=O)O to produce COC(=O)CCC(=O)c1cc(N)ccc1OCC(O)CNC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.