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2-hydroxy-4,8,8-trimethyl-9,10-dihydro-4H-pyrano[3,2-f]isochromene-5,6-dione

2-hydroxy-4,8,8-trimethyl-9,10-dihydro-4H-pyrano[3,2-f]isochromene-5,6-quinone

9,10-Dihydro-5-hydroxy-4,8,8-trimethyl-2H,4H-benzo[1,2-b:4,3-c']dipyran-2,6(8H)-dione