Fagopyrin
Introduction '''Fagopyrin''' is a  term used for several closely related naturally occurring substances in the buckwheat plant.Their chemical structure contains a naphthodianthrone skeleton similar to that of hypericin. Fagopyrin is located almost exclusively in the cotyledons of the buckwheat herb. When ingested, fagopyrins cause sensitivity to light.
References
External links * Phytopharmaka VII: Forschung und klinische Anwendung