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