caffeine
Also called trimethylxanthine (C8H10N4O2), an alkaloid extracted from coffee, and also found in tea, cocoa, and cola. Caffeine stimulates the central nervous system and heart, and is a diuretic. It increases alertness, in excess causing insomnia, and is mildly addictive. It is often included with aspirin or codeine in analgesic preparations. Melting point 238°C.
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