Using COC(=O)c1ccc(C(=O)C(=O)c2ccc3c(c2)C(C)(C)CCC3(C)C)cc1 to produce CC1(C)CCC(C)(C)c2cc(C(=O)C(=O)c3ccc(C(=O)O)cc3)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.