Using Nc1ccccn1, COCN1c2cc(C(=O)CBr)ccc2Sc2nccnc21 to produce COCN1c2cc(C(=O)CNc3ccccn3)ccc2Sc2nccnc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.