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5-O-Caffeoylshikimic acid (dactylifric acid) was isolated from bracken fern as a major constituent of its acutely toxic fraction, which causes depression of leucocytes and thrombocytes in calves. 5-O-Caffeoylshikimic acid exhibited an antithiamine effect in vitro, but had no hematuric effect in guinea pigs.
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Masamichi Fukuoka (1982) studied this question.
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