38565-48-9 4-((4-((4-Nitrophenyl)azo)phenyl)azo)phenol EINECS 254-003-9 Phenol, 4-((4-((4-nitrophenyl)azo)phenyl)azo)- Phenol, 4-((4-(4-nitrophenylazo)phenyl)azo)- p-((p-((p-Nitrophenyl)azo)phenyl)azo)phenol