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Caffeine
C8H10N4O2 · 58-08-2
The world's most-consumed psychoactive compound. A central-nervous-system stimulant of the methylxanthine class found in coffee, tea, and cocoa.
Aspirin
C9H8O4 · 50-78-2
Acetylsalicylic acid — the original NSAID. Synthesized by Felix Hoffmann at Bayer in 1897 and still on the WHO Essential Medicines list as an analgesic, antipyretic, and antiplatelet.
Ethanol
C2H6O · 64-17-5
Ethanol — the simplest two-carbon alcohol. Anesthetic, recreational depressant, fuel oxygenate, and ubiquitous laboratory solvent. Produced industrially by ethylene hydration and biologically by yeast fermentation.
Vanillin
C8H8O3 · 121-33-5
Vanillin — the principal flavor compound in vanilla. A phenolic aldehyde whose biosynthetic precursors are still under active study; most commercial supply is derived from guaiacol or lignin rather than vanilla orchids.

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48591
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