Areca catechu
Arecatannins are a class of condensed tannins in the sub-class procyanidins contained in the seeds of "Areca catechu" also called betel nut. The arecatannin-type natural products from Ceylonese cassia bark and Areca seed are examples polyphenols by both current definitions, and fit the distinct definition of a polymeric phenol as well.