3,4,10-triazabicyclo[4.4.0]deca-1,3,5,7,9-pentaene

    Parameter     ppm  Hz

      D(A)         9.31
      D(B)         7.88
      D(C)         8.40
      D(D)         9.63
      D(E)         9.79
       J(A,B)          4.5
       J(A,C)          1.7
       J(A,D)          0.0
       J(A,E)          0.0
       J(B,C)          8.5
       J(B,D)          0.0
       J(B,E)          0.0
       J(C,D)          0.0
       J(C,E)          0.75
       J(D,E)          1.5
     
     QUEGUINER,G. & PASTOUR,P. BULL.SOC.CHIM.FR. 1969, 2519