Using CCC12CCC(c3ccccc3)(CN1)N(CC(=O)OCc1ccccc1)C2=O to produce CCC12CCC(c3ccccc3)(CN1)N(CC(=O)O)C2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.