5-[(9,10-dihydro-9,10-dioxo-1-anthryl)azo]-1,2-dihydro-6-hydroxy-4-methyl-2-oxonicotinonitrile

5-[[(9,10-Dihydro-9,10-dioxoanthracen)-1-yl]azo]-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-3-pyridinecarbonitrile