Using C=C(OCC)C1=C2c3ccc(OC)c(Cl)c3CC2(CCCC)CCC1=O to produce CCCCC12CCC(=O)C(C(C)=O)=C1c1ccc(OC)c(Cl)c1C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.