Also Called: Cuprate(4-), [µ-[[3,3'-methylenebis[6- [[5-[(2,4-disulfophenyl)azo]-2,4-dihydroxyphenyl]azo ]benzoato]](8-)]]di-, sodium;Cuprate(4-), [µ-[[3,3'-methylenebis[6-[[5-[(2,4-disulfophenyl)azo]-2,4-dihydroxyphenyl]azo]benzoato]](8-)]]di-, sodium