Fig. 5 in Flavonoids in the flowers of Primula × polyantha Mill. and Primula primulina (Spreng.) H. Hara (Primulaceae)

Fig. 5. Chemical structures of flavonols isolated from the flowers of Primula × polyantha cultivars and P. primulina. Flavonols A, B, C, and E: R = OH Flavonols D and F: R = H.Published as part of Tatsuzawa, Fumi, Mizuno, Takayuki, Kikuchi, Ryo, Kato, Kazuhisa, Ota, Toru, Murai, Yoshinori, Yangzom, Rinchen & Iwashina, Tsukasa, 2021, Flavonoids in the flowers of Primula × polyantha Mill. and Primula primulina (Spreng.) H. Hara (Primulaceae), pp. 1-13 in Phytochemistry (112827) 189 on page 8, DOI: 10.1016/j.phytochem.2021.112827, http://zenodo.org/record/825935