Also Called: Cuprate(4-), [µ-[[3,3'-methylenebis[6- [[5-[(2,4-disulfophenyl)azo]-2,4-dihydroxyphenyl]azo ]benzoato]](8-)]]di-, tetrasodium;Cuprate(4-), [.mu.-[[3,3'-methylenebis[6-[2-[5-[2-(2,4-disulfophenyl)diazenyl]-2-(hydroxy-.kappa.O)-4-hydroxyphenyl]diazenyl-.kappa.N1]benzoato-.kappa.O]](8-)]]di-, sodium (1:4);Cuprate(4-), [µ-[[3,3'-methylenebis[6-[[5-[(2,4-disulfophenyl)azo]-2,4-dihydroxyphenyl]azo]benzoato]](8-)]]di-, tetrasodium;Cuprate(4-), [[]µ-[[][[]3,3'-methylenebis[[]6-[[]2-[[]5-[[]2-(2,4-disulfophenyl)diazenyl]-2-(hydroxy-[?]O)-4-hydroxyphenyl]diazenyl-[?]N1]benzoato-[?]O]](8-)]]di-, sodium (1:4)