The unambiguous detection of kaurenic derivatives in aqueous infusions of Montanoa tomentosa by GC-MS and 2D-NMR spectroscopy: An answer to contradictory reports

Abstract

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., was carried out using CC-MS and 2D-NMR methods to resolve contradictory HPLC results from previous reports.