Using COC(=O)[C@@H](C)Oc1cc(C(C)(C)C)cc(C(C)(C)C)c1 to produce C[C@@H](Oc1cc(C(C)(C)C)cc(C(C)(C)C)c1)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.