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Caffeine molecule Illustration and Icon
Caffeine molecule
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A stylized ball-and-stick structural diagram depicts a methylxanthine alkaloid with a fused imidazole-pyrimidine (purine) ring. Grey spheres indicate carbon atoms forming the heterocycle and three terminal methyl groups; blue spheres mark four ring nitrogens; red spheres show two carbonyl oxygens. Double lines denote carbonyl and C=C bonds. In biochemistry and pharmacology, this small molecule acts as a central nervous system stimulant by antagonizing adenosine receptors (ARs), notably A1 and A2A, functioning as an exogenous ligand within neurotransmission pathways.
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