C.I. Pigment Red 251

3-(1-Anthraquinonylazo)-5,7-dichloro-2-methyl-1H-pyrazolo[5,1-b]quinazolin-9-one

1-[(5,7-dichloro-1,9-dihydro-2-methyl-9-oxopyrazolo[5,1-b]quinazolin-3-yl)azo]anthraquinone

9,10-Anthracenedione, 1-(5,7-dichloro-1,9-dihydro-2-methyl-9-oxopyrazolo5,1-bquinazolin-3-yl)azo-

1-[(5,7-dichloro-1,9-dihydro-2-methyl-9-oxopyrazolo[5,1-b] quinazolin-3-yl)azo]-9,10-anthracenedione

3-[(9,10-Dihydro-9,10-dioxoanthracen-1-yl)azo]-5,7-dichloro-2-methyl-1H-pyrazolo[5,1-b]quinazolin-9-one