Acetic acid 1,3-dimethyl-6-oxo-2,4-cyclohexadienyl ester

    Parameter     ppm  Hz

      D(A)         6.00
      D(B)         6.73
      D(C)         5.80
      D(D)         1.95
       J(A,B)          9.8
       J(A,C)          0.8
       J(A,D)          0.5
       J(B,C)          2.4
       J(B,D)          0.3
       J(C,D)          1.5
     
      D(E)         2.00
     
      D(F)         1.27
     
     BUBB,W.A. ET AL. ORG.MAGN.RESON. 9, 167 (1977)