Stable Isotope-Assisted Computational Mass Spectrometry Reveals Root-Specific Homopipecolic Acid-Containing Flavonoids in Glycyrrhiza Species
The carbon number was determined, followed by the molecular formula and substructure prediction in combination with MS/MS similarity-based molecular networking, and five previously unreported homopipecolic acid-conjugated flavonoids in the roots of G. uralensis and G. glabra were discovered.