methyl 3-methylquinoxaline-2-carboxylate

1-(3-methyl-4-oxidoquinoxalin-4-ium-2-yl)ethanone

3-methyl-4-oxidoquinoxalin-4-ium-2-carboxylic acid

3H-pyridazino[4,5-b]quinoxalin-4-one

(9ci)-1H-苯并咪唑-2-羧酸肼