3-Fluoro-5-methyl-6-oxo-2,4-cyclohexadienylidenediacetate

    Parameter     ppm  Hz

      D(A)         6.526
      D(B)         5.525
      D(C)         1.966
       J(A,B)          3.02
       J(A,C)          1.67
       J(A,X)          8.36
       J(B,C)          0.76
       J(B,X)         10.07
       J(C,X)          0.70
     
      D(D)         2.045
     
     BUBB,W.A. ET AL. ORG.MAGN.RESON. 9, 167 (1977)