3,3'-(Cyclohexylidenebis((2-methoxy-4,1-phenylene)azo))bis(4,6-dihydroxynaphthalene-2-sulphonic) acid;3-[4-[1-[4-[(1,7-dihydroxy-3-sulfo-2-naphthyl)azo]-3-methoxy-phenyl]cyclohexyl]-2-methoxy-phenyl]azo-4,6-dihydroxy-naphthalene-2-sulfonic acid
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