3-((4-Methoxy-2-nitrophenyl)azo)-2-methylpyrazolo(5,1-b)quinazolin-9(1H)-one 80019-25-6 EINECS 279-367-6 Pyrazolo(5,1-b)quinazolin-9(1H)-one, 3-((4-methoxy-2-nitrophenyl)azo)-2-methyl-