3-Pyridinecarbonitrile, 5-((4-(1,4-dihydro-4-oxo-2-quinazolinyl)phenyl)azo)-2,6-dihydroxy-4-methyl- 5-((4-(3,4-Dihydro-4-oxo-2-quinazolinyl)phenyl)azo)-2,6-dihydroxy-4-methylnicotinonitrile 50603-25-3 EINECS 256-645-5