Thieno[3,2-b][1]benzothiophene

    Parameter     ppm  Hz

      D(A)         7.849
      D(B)         7.411
      D(C)         7.347
      D(D)         7.850
       J(A,B)          8.2
       J(A,C)          1.28
       J(A,D)          0.66
       J(B,C)          7.28
       J(B,D)          1.08
       J(C,D)          8.0
     
      D(E)         7.502
      D(F)         7.316
       J(E,F)          5.3
     
     EWING,D.F. & SCROWSTON,R.M. ORG.MAGN.RESON. 3, 405 (1971)