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Phyllanthurinolactone (1) and its three stereoisomers 18−20 were synthesized, and only 1 was bioactive as the leaf-closing factor of a nyctinastic plant, Phyllanthus urinaria L. X-ray analysis of the tetraacetylglucoside 17 was executed, and the absolute configuration of 1 was determined as 6S,7aR.
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Audran et al. (1998) studied this question.
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