Using O=C1CCC(=O)N1Br, C#Cc1ccc(CCC(C)(C(=O)OC)S(C)(=O)=O)cc1 to produce COC(=O)C(C)(CCc1ccc(C#CBr)cc1)S(C)(=O)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.