71786-54-4 Cobalt, 6-amino-5-((2-hydroxy-4-nitrophenyl)azo)-N-(2-hydroxypropyl)-2-naphthalenesulfonamide 2-((5-(aminosulfonyl)-2-hydroxyphenyl)azo)-N-(2-ethylhexyl)-3-oxobutanamide sodium complexes EINECS 276-011-1