Using CCCCCC(O)c1ccc(C2=C(Br)CC[C@@H]2CCCc2ccc(C(=O)O)s2)cc1 to produce CCCCCC(O)c1ccc(C2=CCC[C@@H]2CCCc2ccc(C(=O)O)s2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.