Using O=C(NC(Cl)C(Cl)(Cl)Cl)c1ccc(Cl)cc1, N#C[S-] to produce O=C(NC(N=C=S)C(Cl)(Cl)Cl)c1ccc(Cl)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.