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