1,3-di-2-pyridylurea

    Parameter     ppm  Hz

      D(A)         8.52
      D(B)         7.24
      D(C)         7.96
      D(D)         8.01
       J(A,B)          4.8
       J(A,C)          1.8
       J(A,D)          1.2
       J(B,C)          8.0
       J(B,D)          1.0
       J(C,D)          8.6
     
      D(E)        10.8
     
     BRUEGEL,W. Z.ELEKTROCHEM.BER.BUNSENGES.PHYS.CHEM.
     66, 159 (1962)
     H(E):BROAD.