5-[2-(2-amino-5-methyl-4-oxo-1-cyclohexa-2,5-dienylidene)hydrazinyl]-2,4-dimethylbenzenesulfonic acid
5-[2-(2-amino-5-methyl-4-oxo-1-cyclohexa-2,5-dienylidene)hydrazinyl]-2,4-dimethylbenzenesulfonic acid