A bitter white alkaloid, C8H10N4O2, often derived from tea or coffee and used in medicine chiefly as a mild stimulant and to treat certain kinds of headache.
咖啡因一种苦味的白色生物碱,C8H10N4O2,通常得自咖啡或茶,在药品中主要作为温和兴奋剂及治疗特定的头痛病。
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