Using BrBr, CCCc1nc2c(N)nccc2n1CCOCCNS(C)(=O)=O to produce CCCc1nc2c(N)ncc(Br)c2n1CCOCCNS(C)(=O)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.