Using COC(=O)CCCCn1cc(C2CCCCC2)c2ccc(C(=O)OC)cc21 to produce O=C(O)CCCCn1cc(C2CCCCC2)c2ccc(C(=O)O)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.