(E)-3,4-Dihydroxy-2-methyl-6-oxo-2,4-heptadienoic acid-gamma-lactone (E)-4-Hydroxy-m-methyl-5-(2-oxopropylidene)-2(5H)-furanone 150671-08-2 2(5H)-Furanone, 4-hydroxy-3-methyl-5-(2-oxopropylidene)-, (E)- Xanthofusin