Classical methods in structure elucidation of natural products Hundred Years of Structure Elucidation Compounds with only Oxygen Functionalities. Ascorbic Acid Hinokitiol Cantharidin Camphor [alpha] Terpineol Lactaroviolin Santonin Estrone [alpha] Tocopherol Compounds with Nitrogen and Oxygen Functionalities. Pyridoxine Muscarine Lupinine Lysergic Acid Riboflavin Cocaine Quinine Colchicine Luciferin Strychnine Compounds with Additional Functionalities. Biotin Thiamine Griseofulvin Compounds without Heteroatom Functionalities. Decacyclene Carotene Can You Do it Yourself. Penicillin