Using CC(C)(C)OC(=O)N[C@@H]1C[C@H]2OCC[C@@]2(CO)C1, CC(C)=O to produce CC(C)(C)OC(=O)N[C@@H]1C[C@H]2OCC[C@@]2(C(=O)O)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.