Using O=S(=O)(c1ccccc1)n1cc(-c2cnn(C3CCNCC3)c2)c2ccc(F)cc21, OCCBr to produce O=S(=O)(c1ccccc1)n1cc(-c2cnn(C3CCN(CCO)CC3)c2)c2ccc(F)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.