Using NC(=O)OCC1=C(C(=O)O)N2C(=O)C(NC(=O)CC(=O)CBr)[C@H]2SC1, NC(N)=S to produce NC(=O)OCC1=C(C(=O)O)N2C(=O)C(NC(=O)Cc3csc(N)n3)[C@H]2SC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.