Using OCCCBr, O=S1(=O)CCN(c2cc(Cl)c3ccccc3n2)Cc2ccc(O)cc21 to produce O=S1(=O)CCN(c2cc(Cl)c3ccccc3n2)Cc2ccc(OCCCO)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.