2,3-Dihydro-9-methyl-7H-pyrano(2,3-g)-1,4-benzodioxin-7-one 30211-36-0 6,7-(Ethylenedioxy)-4-methylbenzopyran-2-one 7H-Pyrano(2,3-g)-1,4-benzodioxin-7-one, 2,3-dihydro-9-methyl- BRN 1248757