Parameter     ppm  Hz

      D(A)         5.70
      D(B)         7.30
       J(A,A')         0.6
       J(A,B)         11.2
       J(A,B')        -1.2
       J(A',B)        -1.2
       J(A',B')       11.2
       J(B,B')        12.1
     
     HALL,J.H. & PATTERSON,E. J.AM.CHEM.SOC. 89, 5856 (1967)