Table 1. Endo Structure.

 Conformer     Mole         Torsion/    
             fraction        3JH1H6      
     a        .55          -57.8/2.3     
     b        .21          -56.7/2.4     
     c        .16           51.7/4.4      
     d        .08           79.4/1.3

Table 2. Exo structure.

 Conformer     Mole         Torsion/    
             fraction        3JH1H6      
     a        .49          -56.9/2.4     
     b        .39           68.7/2.3      
     c        .07          171.3/9.8     
     d        .05          -55.4/2.6