Using O=C(CON=C(C(=O)O)C(=O)CBr)OCC(Cl)(Cl)Cl, NC(N)=S to produce Nc1nc(C(=NOCC(=O)OCC(Cl)(Cl)Cl)C(=O)O)cs1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.