Using COC(=O)C1CC2=C(C(=O)C3C(OC(C)=O)c4ccccc4C(OC(C)=O)C3C2=O)C2(C1)SCCS2 to produce COC(=O)C1CC2=C(C(=O)c3cc4ccccc4cc3C2=O)C2(C1)SCCS2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.