Acetic acid 1-methyl-6-oxo-3-(trimethylsilyl)-2,4-cyclohexadienyl ester

    Parameter     ppm  Hz

      D(A)         6.020
      D(B)         6.914
      D(C)         6.265
       J(A,B)          9.73
       J(A,C)          0.85
       J(B,C)          1.72
     
      D(D)         2.032
     
      D(E)         1.285
     
      D(F)         0.18
     
     BUBB,W.A. ET AL. ORG.MAGN.RESON. 9, 167 (1977)