6,7-dihydro-6,8,8,10-tetramethyl-8H-pyrano(3,2-g)chromone-2-carboxylic acid

3,4-Dihydro-2,2,4,10-tetramethyl-6-oxo-2H,6H-benzo[1,2-b:5,4-b']dipyran-8-carboxylic acid