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- The [α]D-values of different samples of the aglycone reported by different research groups are: −20° (c 1.25, EtOH) for (−)-rhododendrol (betuligenol) from T. baccata; −18.5° (c 3.88, EtOH) for (−)-rhododendrol (betuligenol) B. alba, +20° (c 1.0, EtOH) for (+)-rhododendrol from A. nikoense MAXIM; and +17.1° (c 2.0, EtOH) for (+)-rhododendrol (d-betuligenol) from R. maximum. See Ref.[10]