15525-22-1 6421-64-3 Cobaltate(1-), bis(2-((2-(hydroxy-kappaO)-4-nitrophenyl)azo-kappaN1)-1-naphthalenolato(2-)-kappaO)-, hydrogen EINECS 229-171-1 Hydrogen bis(2-((2-hydroxy-4-nitrophenyl)azo)naphthalen-1-olato(2-))cobaltate(1-)