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Isolation and identification by 2D NMR of two new complex saponins from Michrosechium helleri
Two complex saponins, amole F and G, were characterized and their spectra were assigned using only 1D and 2D 1H and NMR methods. Amole F and G have seven and six monosaccharides, respectively, linkedExpand
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Chemical constituents and cytotoxic activity of Smallanthus maculatus
Smallanthus maculatus (Cav) H. Rob. (Asteraceae, nomenclatural synonym: Polymnia maculata Cav. Icon. [1, 2]) is used by the Highlands Mayas of Chiapas, Mexico, for the treatment of gastrointestinalExpand
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Total assignment of 13C and 1H spectra of three isomeric triterpenol derivatives by 2D NMR: an investigation of the potential utility of 1H chemical shifts in structural investigations of complex
It is shown that a recently proposed indirect heteronuclear shift-correlated pulse sequence, XCORFE, can be used to unambiguously assign the 13C spectra of three isomeric (C30H50O) triterpenols:Expand
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Comparison of crystal and solution structures and 1H and 13C chemical shifts for grandiflorenic acid, kaurenoic acid, and monoginoic acid
The crystal structure of monoginoic acid, 3, is determined and compared with previously reported structures of kauradienoic acid, 1, and kaurenoic acid, 2. 1H and 13C chemical shifts are assigned forExpand
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The unambiguous detection of kaurenic derivatives in aqueous infusions of Montanoa tomentosa by GC-MS and 2D-NMR spectroscopy: an answer to contradictory reports.
The qualitative analytical detection of kaurenic compounds kauradienoic (kauradien-9(11),16-dienoic acid) (1), monoginoic (2), and kaurenoic acids (3) in the infusion of Montanoa tomentosa Cerv., wasExpand
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In vitro culture of Montanoa tomentosa for the production of diterpenic acids
Following a solid phase extraction, GC-MS and GC-FID procedures, the production of three kaurane derivatives (grandiflorenic, kaurenoic and monoginoic acids) was detected in callus and cellExpand
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Investigation of the Advantages and Limitations of Forward Linear Prediction for Processing 2D Data Sets
Although the potential advantages of f1 forward linear prediction for the processing of multi‐dimensional NMR spectra are well established, this method is surprisingly little used for 2D spectra usedExpand
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Isolation and characterization of five new tetrasaccharide glycosides from the roots of Ipomoea stans and their cytotoxic activity.
Five new tetrasaccharide glycosides, stansins 1-5, were isolated from the roots of Ipomoea stans, and their structures were elucidated using spectroscopic and chemical methods. Preliminary testingExpand
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Characterization, by two-dimensional NMR spectroscopy, of a complex tetrasaccharide glycoside isolated from Ipomoeastans
A mixture of glycosidic acids, each of which consisted of a tetrasaccharide unit linked by an anomeric carbon to 11-hydroxypalmitic acid and containing short-chain fatty acids ester-linked to theExpand
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