LAWRENCE LAWRY / SCIENCE PHOTO LIBRARY LAWRENCE LAWRY / SCIENCE PHOTO LIBRARY
Caffeine. Molecular model of the alkaloid stimulant and legal drug caffeine. Caffeine is found in drinks such as tea, coffee, and fizzy drinks. It is also found in chocolate. The molecule's chemical formula is C8.H10.N4.O2. In this ball-and-stick model, atoms are colour-coded: carbon (black), hydrogen (white), nitrogen (dark blue), and oxygen (red).
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