1H-Indoledisulfonicacid, 2-(1,3-dihydro-3-oxo-2H-indol-2-ylidene)-2,3-dihydro-3-oxo-, disulfoderiv., tetrapotassium salt (9CI); [D2,2'-Biindoline]tetrasulfonic acid, 3,3'-dioxo-,tetrapotassium salt (7CI,8CI); Potassium indigotetrasulfonate
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