Fisetinidin is an anthocyanidin. It has been obtained from the heartwood of Acacia mearnsii, from the bark of Rhizophora apiculata and can also be synthesized. Fisetinidin is very similar in structure to fisetin, which itself differs in structure from quercetin only by an additional hydroxyl group on the latter.
The compounds of every Wikipedia article carrying a Chembox or a Drugbox, refreshed daily, with the values their infoboxes give. The pages need JavaScript; the API does not.