Using CCC(CC)c1cc(C)nn2cc(C)nc12, Cn1nc(Br)c(Br)c1Br to produce CCC(CC)c1cc(C)nn2c(-c3c(Br)c(Br)nn3C)c(C)nc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.