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From the root of licorice (Glycyrrhiza spp., Leguminosae) three new coumestan derivatives, named glycyrol, 5-O-methylglycyrol and isoglycyrol, have been isolated, whose structures have been established to be Ia, IIa and IIIa, respectively. Betulic acid was also obtained.
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Saitoh et al. (1969) studied this question.
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