Using COC(=O)c1cccc(O)c1, C[C@@H](O)C(=O)OC(C)(C)C to produce COC(=O)c1cccc(O[C@@H](C)C(=O)OC(C)(C)C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.