3-((4-Chloro-2-nitrophenyl)azo)-2-methylpyrazolo(5,1-b)quinazolin-9(1H)-one 74336-59-7 EINECS 277-823-9 Pyrazolo(5,1-b)quinazolin-9(1H)-one, 3-((4-chloro-2-nitrophenyl)azo)-2-methyl-