2H,6H-Benzo(1,2-b:5,4-b')dipyran-8-carboxylic acid, 3,4-dihydro-2,2,4,10-tetramethyl-6-oxo- 6,7-Dihydro-6,8,8,10-tetramethyl-8H-pyrano(3,2-g)chromone-2-carboxylic acid 69873-18-3 Eaa chromone