Proanthocyanidins

**Definition:** Dimers and oligomers of flavan-3-ol units (CATECHIN analogs) linked mainly through C4 to C8 bonds to leucoanthocyanidins. They are structurally similar to ANTHOCYANINS but are the result of a different fork in biosynthetic pathways.

**Tree numbers:** - D03.383.663.283.266.450.700 - D03.633.100.150.266.450.700 - D05.750.078.937.429

**Synonyms:** - Anthocyanidin Polymers - Tannin, Condensed - Condensed Tannins - Condensed Tannin