Using CCNC(=O)c1nccc2c1CN(Cc1ccc(C(=O)OC(C)(C)C)c(C)c1)C2=O to produce CCNC(=O)c1nccc2c1CN(Cc1ccc(C(=O)O)c(C)c1)C2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.