1. Glucose (C6H12O6): A simple sugar that is the primary source of energy for living organisms. It's found in fruits, honey, and other foods.

2. Methane (CH4): The simplest hydrocarbon, a major component of natural gas and a potent greenhouse gas.

3. Ethanol (C2H5OH): An alcohol found in alcoholic beverages and used as a fuel and solvent.

4. Aspirin (C9H8O4): A common pain reliever and anti-inflammatory drug, also known as acetylsalicylic acid.