2,3,7,8-Tetraidro-2,7-dimetil-4H,5H-pirano(4,3-b)piran-4,5-dione [Italian] 2,7-Dimethyl-2,3,4,5,7,8-hexahydropyrano(4,3-b)pyran-4,5-dione 27424-77-7 4H,5H-Pyrano(4,3-b)pyran-4,5-dione, 2,3,7,8-tetrahydro-2,7-dimethyl 5-19-05-00047 (Beilstein Handbook Reference) BRN 1311446