Using BrCc1ccccc1, O=S1(=O)CCCc2cc(C3OCCO3)ccc21 to produce O=Cc1ccc2c(c1)CCC(Cc1ccccc1)S2(=O)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.