(7aR)-1H-Imidazo[1,5-c]thiazole-5,7(6H,7aH)-dione

    Parameter     ppm  Hz

      D(A)         4.47
      D(B)         3.12
      D(C)         3.32
       J(A,B)          5.5
       J(A,C)          8.9
       J(B,C)        -11.6
     
      D(D)         4.09
      D(E)         4.85
       J(D,E)         -9.8
     
      D(F)        11.2
     
     BORREMANS,F.A.M. ET AL. ORG.MAGN.RESON. 21, 328 (1983)