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Hint: Question mark (?) is a wildcard. Question mark substitutes one character.
English
noun
:
hydroxybutyric acid
1.
hydroxybutyric acid
(substance)
hydroxy derivative of butyric acid
Synonyms
oxybutyric acid
Broader (hypernym)
butanoic acid
,
butyric acid
Narrower (hyponym)
beta-hydroxybutyric acid
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