Dipotassium 5,5'-dibromo-4,4'-dichloro(2,2'-bi-1H-indole)-3,3'-diyl disulphate;dipotassium [5-bromo-2-(5-bromo-4-chloro-3-sulfonatooxy-indol-2-ylidene)-4-chloro-indol-3-yl] sulfate
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