2,3-dimethoxy-6-methyl-7-nitroquinoxaline-5-carboxylic acid methyl ester

6-bromo-5-methyl-8-nitro-1H-benzo[d][1,3]oxazine-2,4-dione

methyl 2,3-diamino-6-methyl benzoate

6-methyl-2,3-dioxo-1,2,3,4-tetrahydroquinolxaline-5-carboxylic acid

2,3-dichloro-6-methyl-7-nitroquinoxaline-5-carboxylic acid methyl ester