coronene

Polycyclic aromatic hydrocarbon (PAH) that has a crown shaped structure. It is :

C₂₄H₁₂

        H      H
         \____/
  H      /    \      H
   \____/      \____/
   /    \      /    \
H_/      \____/      \_H
  \      /    \      /
   \____/      \____/
   /    \      /    \
H_/      \____/      \_H
  \      /    \      /
   \____/      \____/
   /    \      /    \
  H      \____/      H
         /    \
        H      H

Pretty, eh? (oh, double bonds not included for convenience. Since it's aromatic (follows the rules) you can work it out.)