Allan, R. D. published the artcileFlavanone quinones from Cyperus species, Related Products of tetrahydropyran, the publication is Tetrahedron Letters (1973), 7-8, database is CAplus.
The flavonone quinones remerin, breverin, and scaberin (I R = R1 = H; R or R1 = Me or H; R1 = Me, resp.) were isolated from Remeria maritima, C. brevibracteatus, an C. scaber, resp. Methylation of (±)-hesperetin (II, R = H) gave II (R = Me) which on oxidation gave I (R = R1 = H).
Tetrahedron Letters published new progress about 69097-99-0. 69097-99-0 belongs to tetrahydropyran, auxiliary class Other Aliphatic Heterocyclic,Benzene,Phenol,Ether,Inhibitor, name is 5,7-Dihydroxy-2-(3-hydroxy-4-methoxyphenyl)chroman-4-one, and the molecular formula is C16H14O6, Related Products of tetrahydropyran.
Referemce:
https://en.wikipedia.org/wiki/Tetrahydropyran,
Tetrahydropyran – an overview | ScienceDirect Topics