Using CC(C)(C)OC(=O)Cn1c(=O)ccn(CC(=O)OCc2ccccc2)c1=O to produce CC(C)(C)OC(=O)Cn1c(=O)ccn(CC(=O)O)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.