4,6-dimethyl-2H,8H-pyrano[3,2-g]chromene-2,8-dione
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2H,8H-benzo[1,2-b:5,4-b']dipyran-2,8-dione, 4,6-dimethyl-; 4,6-Dimethyl-pyrano[3,2-g]chromene-2,8-dione
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