Using C=CCC1(CCN2CCCC2C(=O)OC(C)(C)C)c2ccccc2CCc2ccccc21 to produce C=CCC1(CCN2CCCC2C(=O)O)c2ccccc2CCc2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.