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Chemically, the term "aglycon" is usually used to refer to the product obtained from acidic hydrolysis. This includes here the C-glycosidic moiety
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Chemically, the term "aglycon" is usually used to refer to the product obtained from acidic hydrolysis. This includes here the C-glycosidic moiety.
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7a
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7a
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33646951679
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note
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18
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0032213555
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Floss, H.G.7
Hopwood, D.A.8
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21
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33646958676
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note
-
Both compounds showed a strong positive NOE effect between 12a-OH and 4a-OH and a weaker one between 4a-OH and 12b-OH. 11 also shows an NOE effect between 12a-OH and 6a-H. The two coupling constants (5, 2 Hz) of 6a-H indicate its equatorial position. The sharpness of the tertiary 12a- and 12b-OH signals and the 2D-NOE spectra indicatees either a water molecule fixed between 12a-OH and 12b-OH through hydrogen bonds or a rapid exchange of the OH groups with residual water. The assumed conformations, i.e., ring A of 11 in twist boat, of 12 in half chair, and ring B in both compounds in chair conformation, are based on MM3* force field calculations.
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0026562230
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33847506630
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Other observed upfield shifts: C-1 (Δδ 0.02 ppm); upfield shifts at C-7 and C-8 were not observable, due to the broadness of the signals or O-exchange with water, respectively
-
Other observed upfield shifts: C-1 (Δδ 0.02 ppm); upfield shifts at C-7 and C-8 were not observable, due to the broadness of the signals or O-exchange with water, respectively.
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26
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33646963271
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diploma thesis, University of Göttingen, Germany
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(b) Weissbach, U., diploma thesis, University of Göttingen, Germany, 1997.
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33847524605
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National Cancer Institute, Bethesda, MD, personal communication. Here, the in vitro antitumor screen consisting of 60 human tumor cell lines was used. For further details
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Sausville, E. A. National Cancer Institute, Bethesda, MD, personal communication. Here, the in vitro antitumor screen consisting of 60 human tumor cell lines was used. For further details, see http://dtp.nci.nih.gov.
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Sausville, E.A.1
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Synthesized from 2-methylhydroquinone and maleic anhydride: Wallenfels, K. Ber. Dtsch. Chem. Ges. 1942, 75, 785.
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