H       H H     O - H
               |        \|    /
               C4        C - C
              /  \      /     \\
        H - C5    C -- C3       O
             |    |    |
        H - C6    C    C2 - H
              \  / \  /
               C7   N1
               |    |
               H    H

Informations required by Austrian law (Offenlegung gem. §25 MedienG): Dr. Michael Ramek, Graz.