Arecatannin B1 is a B type proanthocyanidin found in the betel nut.Screening of various plant extracts used in Ayurvedic medicine for inhibitory effects on human immunodeficiency virus type 1 (HIV-1) protease. Kusumoto I.T., Nakabayashi T., Kida H., Miyashiro H., Hattori M., Namba T. and Shimotohno K., PTR. Phytotherapy research, 1995, vol. 9, no3, pp. 180-184, It is an arecatannin trimer with a 4β→6 bond.
References
External links Arecatannin B1 on http://herbdb.koushi.pref.okinawa.jp (Japanese)