fagopyrin fagopyrin 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 names iupac name 1,3,4,6,8,13-hexahydroxy-10,11-dimethyl-2,5-di(piperidin-2-yl)fenantroperyleen-7,14-dion identifiers cas number 72393-03-4 n 3d model (jsmol) interactive image chemspider 4589856 pubchem cid 5488537 comptox dashboard (epa) dtxsid40993184 inchi inchi=1s/c40h34n2o8/c1-13-11-17(43)23-25-19(13)20-14(2)12-18(44)24-26(20)28-27(25)29-31(35(45)21(15-7-3-5-9-41-15)37(47)33(29)39(23)49)32-30(28)34(40(24)50)38(48)22(36(32)46)16-8-4-6-10-42-16/h11-12,15-16,41-48h,3-10h2,1-2h3key: rofjumitfmrbrf-uhfffaoysa-n smiles o=c1c2=c(c3=c(o)c(c4ccccn4)=c2o)c(c5=c6c(c)=cc(o)=c15)=c7c(c3=c(o)c(c8ncccc8)=c9o)=c9c(c%10=c7c6=c(c)c=c%10o)=o properties chemical formula c40h34n2o8 molar mass 670.718 g·mol−1 appearance red pigment except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). n verify (what is yn ?) infobox references fagopyrin is located almost exclusively in the cotyledons of the buckwheat herb. when ingested, fagopyrins cause sensitivity to light.