Fagopyrin is a term used for several closely related naturally occurring substances in the buckwheat plant.

[1] Their chemical structure contains a naphthodianthrone skeleton similar to that of hypericin.

[2] Fagopyrin is located almost exclusively in the cotyledons of the buckwheat herb.

When ingested, fagopyrins cause sensitivity to light.

[3] This article about an aromatic compound is a stub.