Quinine has the following structure :-

                            CH=CH2
                           /
                          C  
                         /| 
                        C |         
                        |/C
                        |  \
                       /|   \ 
                      / |    \
                     C  N     C
              HO     | /\    /
                \    |/  \  /
                 \ _-C    C
          /\      |     
 CH3O    /  \     |
     \  /    \   / \\  
      \/  /\  \ /   \\ 
      |  /  \  |     |
      | |    | |     |
      |  \  /  |     | 
       \  \/  / \   // 
        \    /   \ //
         \  /     N
          \/