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alkaloid, atomic, atoms, background, blue pink, caffeinated, caffeine, caffeine dependence, caffeine molecule, caffeine structure, chemical, chemical formula, chemistry, coffee, composition, compound, decaffeinating, dependence, design, drawing, drink, drug, energy, energy drinks, formula, guarana, hydrogen, illustration, intoxication, laboratory, line, medicine, methylxanthine alkaloid, molecular, molecule, nitrogen, oxygen, psychoactive, receptor, research, science, stimulant, structure, symbol, tea, technology, theine, wakefulness, xanthine,