2-methoxy-3,6-dimethylpyrazine,3-methoxy-2,5-dimethylpyrazine

    Parameter     ppm  Hz

      D(A)         7.826
      D(B)         2.403
      D(C)         2.385
       J(A,B)          0.2
       J(A,C)          0.65
       J(B,C)          0.65
     
      D(D)         3.939
     
     COX,R.H. & BOTHNER-BY,A.A. J.PHYS.CHEM. 72, 1642 (1968)
     J(A,B) LESS THAN 0.2HZ.