Isolation and structural characterization of unusual pyranoanthocyanins and related anthocyanins from Staghorn sumac (Rhus typhina L.) via UPLC-ESI-MS, 1H, 13C, and 2D NMR spectroscopy

Staghorn sumac fruits were found to contain a rich assortment of anthocyanins, including pyranoanthocyanins displaying distinctive UV-Vis absorption spectra. Structures were characterized by UPLC-ESI-MS and NMR spectroscopy.