Determination of polyphenolic compounds in raw plant materials by NMR spectroscopyAnzhelika Sheremeta, Vasilii Vasil’ev, Vasilii Ivlev, Sergey Goriainov and Victoria RomashchenkoE3S Web Conf., 555 (2024) 03010DOI: https://doi.org/10.1051/e3sconf/202455503010