Using N[C@@H]1c2ccccc2C[C@H]1NC(=O)c1cc2cc(Cl)sc2[nH]1, O=C(Cl)CCl to produce O=C(CCl)N[C@@H]1c2ccccc2C[C@H]1NC(=O)c1cc2cc(Cl)sc2[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.