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      1H and 13C NMR signal assignment of cucurbitacin derivatives from Citrullus colocynthis (L.) Schrader and Ecballium elaterium L. (Cucurbitaceae).

      Magnetic Resonance in Chemistry
      Carbon Isotopes, Citrullus, chemistry, Cucurbitaceae, Cucurbitacins, Magnetic Resonance Spectroscopy, methods, standards, Molecular Conformation, Protons, Reference Standards, Triterpenes

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          Abstract

          2D NMR-derived 1H and 13C NMR signal assignments of six structurally closely related cucurbitacin derivatives are presented. The investigated 2-O-beta-D-glucopyranosylcucurbitacins I, J, K, and L were obtained from Citrullus colocynthis (L.) Schrader whereas the aglyca cucurbitacin E and I were isolated from Ecballium elaterium L. Copyright 2005 John Wiley & Sons, Ltd.

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