Using CC(=O)C(C)(C)C, Cc1c(C(=O)[O-])c(C)c(C(=O)[O-])c(C)c1C(=O)[O-] to produce CC(C)(C)C(=O)CC(=O)c1cc(C(=O)CC(=O)C(C)(C)C)cc(C(=O)CC(=O)C(C)(C)C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.