Promelacacinidin is a polymeric

condensed tannin Condensed tannins (proanthocyanidins, polyflavonoid tannins, catechol-type tannins, pyrocatecollic type tannins, non-hydrolyzable tannins or flavolans) are polymers formed by the condensation of flavans. They do not contain sugar residues. They ...

composed of

mesquitol Mesquitol is a flavan-3-ol, a type of flavonoid. '' Prosopis juliflora'', an invasive New World mesquite now found in Kenya, has unusually high levels of (−)-mesquitol in its heartwood. Mesquitol, with its pyrogallol-type A-ring, is more suscep ...

. This type of tannin can be found in ''

Senegalia afra ''Senegalia afra'', also known as hook-thorn or ''Acacia afra'', is a tree that occurs commonly in southern Africa. Though it is cultivated, it often occurs naturally in Gauteng suburban gardens, together with '' Acacia karroo'' and ''Acacia robu ...

''. The oxidative depolymerization of proteracacinidins yields the

anthocyanidin Anthocyanidins are common plant pigments, the aglycones of anthocyanins. They are based on the flavylium cation, an oxonium ion, with various groups substituent, substituted for its hydrogen atoms. They generally change color from red through p ...

melacacinidin.

References

Condensed tannins Senegalia {{phenol-stub