Using COc1cccc(C(=O)N2CCN(C(=O)OCc3ccccc3)C(C)(C)C2)n1 to produce COc1cccc(C(=O)N2CCNC(C)(C)C2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.