Using CCCCCC(O)CCCC(Cc1ccc(C=CC(=O)O)cc1)C(C)=O to produce CCCCCC(O)CCCC(Cc1ccc(CCC(=O)O)cc1)C(C)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.