When combined with the corresponding 1H NMR signals in the aromatic and olefinic regions (δH 7.56−6.68), an oxymethine (δH 4.87), a methylene (δH 3.35), and two methyl signals (δH 1.20 and 1.19) could be assigned (Table 2), with these data indicating the prenylated biflavonoid nature of 3, similar to 1 and 2.