HNK may refer to:
*
Croatian National Corpus (Croatian: ')
*
Croatian National Theatre (disambiguation) (Croatian: ')
*
Honokiol, a lignan
*
Hydroxynorketamine
Hydroxynorketamine (HNK), or 6-hydroxynorketamine, is a minor metabolite of the anesthetic, dissociative, and antidepressant drug ketamine. It is formed by hydroxylation of the intermediate norketamine, another metabolite of ketamine. As of l ...
, HNK, a metabolite of ketamine
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