2-Formyl-3-thiophenecarboxylic acid methyl ester

    Parameter     ppm  Hz

      D(A)         7.95
      D(B)         7.57
      D(C)        10.53
       J(A,B)          5.10
       J(A,C)          1.55
       J(B,C)          0.0
     
      D(D)         3.94
     
     GRONOWITZ,S. ET AL. ARK.KEMI. 21, 265 (1963)