SEARCH Articles Figures Tables Fischer, G., Tropones, Tropolones, and Tropylium Salts with Fused Heterocyclic Penicillin G, sodium salt Penicillin-G-potassium salt Skill 12.1o-Recognize that inorganic and organic compounds (e.g., water, salt, carbohydrates, lipids, proteins, nucleic acids) are essential to processes within living systems