Using CCCC(=O)c1cc2c(O)c(C(=O)OC(C)(C)C)c(=O)n(CC)c2cc1C to produce CCCC(=O)c1cc2c(O)c(C(=O)O)c(=O)n(CC)c2cc1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.