Using Cc1cc(Br)n2nc(N)nc2c1, OB(O)c1ccc2c(c1)OCCO2 to produce Cc1cc(-c2ccc3c(c2)OCCO3)n2nc(N)nc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.