5,4'-Dihydroxy-7-methoxy-6-methylflavane (compound 15) is a natural product that can be found in Chinese Dragon’s Blood[1].
References
[1] Hao Q, et al. Chalcane-stilbene conjugates and oligomeric flavonoids from Chinese Dragon's Blood produced from Dracaena cochinchinensis. Phytochemistry. 2015 Nov;119:76-82. DOI:10.1016/j.phytochem.2015.09.009