Using CCCCCCCCCCC(Oc1ccc(C2=CCCCCCC2)cc1)C(=O)OCC to produce CCCCCCCCCCC(Oc1ccc(C2=CCCCCCC2)cc1)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.