Afzelechin is a flavan-3-ol, a type of flavonoid. It can be found in Bergenia ligulata (a.k.a. paashaanbhed in Ayurveda traditional Indian medicine).^[1] It exists as at least two major epimers (afzelechin and epiafzelechin).

(2R,3S)-Catechin:NADP⁺ 4-oxidoreductase transforms cis-3,4-leucopelargonidin into afzelechin.^[2]

Arthromerin A (afzelechin-3-O-β-D-xylopyranoside) and arthromerin B (afzelechin-3-O-β-D-glucopyranoside) are afzelechin glycosides isolated from the roots of the fern Arthromeris mairei.^[3] (+)-Afzelechin-O-β-4′-D-glucopyranoside can be isolated from the rhizomes of the fern Selliguea feei.^[4]

Afzelechin-(4α→8)-afzelechin (molecular formula C₃₀H₂₆O₁₀, molar mass: 546.52 g/mol, exact mass: 546.152597, CAS number: 101339-37-1, Pubchem CID: 12395) is a B type proanthocyanidin.^{[citation needed]}

ent-Epiafzelechin-3-O-p-hydroxybenzoate-(4α→8,2α→O→7)-epiafzelechin is an A-type proanthocyanidin found in apricots (Prunus armeniaca).^[5]

Selligueain A (epiafzelechin-(4β→8,2β→O→7)-epiafzelechin-(4β→8)-afzelechin) is an A type proanthocyanidin.^{[citation needed]}