1) By condensation of 3-sulfonamido-4-(3-methylanilino)pyridine (I) with isopropylisocyanate (II) by means of triethylamine at 95 C.
2) By condensation of m-toluidine (III) with 1-isopropyl-3-(4-chloro-3-pyridylsulfonyl)urea (IV) by means of Cu at 95 C.