Using CCC(=O)CN(CC(=O)OC(C)(C)C)C(c1ccccc1)c1ccccc1 to produce CCC(O)CN(CC(=O)OC(C)(C)C)C(c1ccccc1)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.