1-hydroxy-4-methyl-1,4-dihydroquinoxaline-2,3-dione 2,3-quinoxalinedione, 1,4-dihydro-1-hydroxy-4-methyl- InChI=1/C9H8N2O3/c1-10-6-4-2-3-5-7(6)11(14)9(13)8(10)12/h2-5,14H,1H