Classification of Natural Products Terpenoids and steroids Over 35,000 known Derived biosynthetically from isopentenyl diphosphate Terpenoids exhibit an immense variety of structures Steroids have a common tetracyclic carbon skeleton that are biosynthesized from triterpene lanosterolTerpenoids and steroids ▪ Over 35,000 known ▪ Derived biosynthetically from isopentenyl diphosphate ▪ Terpenoids exhibit an immense variety of structures ▪ Steroids have a common tetracyclic carbon skeleton that are biosynthesized from triterpene lanosterol Classification of Natural Products