Using CCOC(=O)C(Cc1c(C)cc(C(C)(C)C)c(O)c1C)C(=O)OCC to produce Cc1cc(C(C)(C)C)c(O)c(C)c1CC(C(=O)O)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.