Using C=CCNC(=O)OC(C)(C)C, CCCC(CCC)C(=O)Nc1cccc(Br)c1 to produce CCCC(CCC)C(=O)Nc1cccc(/C=C/CNC(=O)OC(C)(C)C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.