Geohopanoids, compounds based on the carbon skeleton shown for hopane, have been found in...

Geohopanoids, compounds based on the carbon skeleton shown for hopane, have been found in every geological sediment that has been examined for their presence, and rank among the most abundant natural products on Earth. It is fairly easy to see that hopane contains five rings. Verify that hopane is pentacyclic by applying the bond-disconnection rule.