Using CC1=C(C(=O)O)CCC2(C)C3=C(CCC12)C(=O)C(C(C)C)=CC3=O to produce CC1=C(C(=O)O)CCC2(C)c3c(O)cc(C(C)C)c(O)c3CCC12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.