[hahy-puh-zan-theen, -thin]
a white, crystalline, almost water-soluble, alkaloidal purine derivative, C 5 H 4 N 4 O, found in animal and vegetable tissues: used chiefly in biochemical research.

1835–45; hypo- + xanthine

hypoxanthic, adjective
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World English Dictionary
hypoxanthine (ˌhaɪpəˈzænθiːn, -θɪn)
a white or colourless crystalline compound that is a breakdown product of nucleoproteins. Formula: C5H4N4O

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

hypoxanthine hy·po·xan·thine (hī'pō-zān'thēn')
A purine present in muscle and other tissues, formed during uric acid synthesis.

The American Heritage® Stedman's Medical Dictionary
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