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Oenothein B, isolated from the leaves of Oenothera erythrosepala (Onagraceae), had host-mediated antitumor activity and antiviral effects on human immunodefficiency virus (HIV) and herpes simplex virus (HSV). It is a dimeric hydrolyzable tannin with a cyclic structure 1.
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Hatano et al. (1989) studied this question.
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