Using COC(=O)[C@@H](C)Oc1ccc(C(C)(C)C)cc1C(C)(C)C to produce C[C@@H](Oc1ccc(C(C)(C)C)cc1C(C)(C)C)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.