Using CCNC(=O)Nc1nc2c(s1)-c1nc(Nc3ccc(Br)cc3)sc1CC2 to produce CCNC(=O)Nc1nc2ccc3sc(Nc4ccc(Br)cc4)nc3c2s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.