Monoclinic boscalide (2-chloro-N-(4'-chloro-2-biphenylyl)-nicotinamide) crystal modification (modification II) with a m. pt. of 147-148[deg]C, is new. An independent claim is also included for a preparation of modification II. ACTIVITY : Herbicide. No agricultural data is given. MECHANISM OF ACTION : None given.Ovaj se izum odnosi na monoklinski 2-kloro-N-(4'-klorobifenil-2-yl)nikotinamid formule I, tališta na 147 - 148°C, kao i na postupak njegovog pripravljanja.