3,9-Dimethoxy-6a,11a-dihydro-6H-benzofuro[3,2-c][1]benzopyran

    Parameter     ppm  Hz

      D(A)         7.40
      D(B)         6.61
      D(C)         6.45
       J(A,B)          8.5
       J(A,C)          0.3
       J(B,C)          2.4
     
      D(D)         3.74
     
      D(E)         7.10
      D(F)         6.42
      D(G)         6.43
       J(E,F)          8.8
       J(E,G)          0.3
       J(F,G)          2.7
     
      D(H)         3.72
     
      D(I)         5.458
      D(J)         4.196
      D(K)         3.599
      D(L)         3.435
       J(I,J)          0.6
       J(I,K)         -0.8
       J(I,L)          7.0
       J(J,K)        -11.1
       J(J,L)          5.5
       J(K,L)         10.8
     
     PACHLER,K.G.R. & UNDERWOOD,W.G.E. TETRAHEDRON 23, 1817 (1967)
     J(A,C)<0.3HZ. J(E,G)<0.3HZ. H(D) & H(H) MAY BE INTERCHANGED.