... : 81-11-8 EINECS No: 201-325-2 DSD acid4,4'-Diaminodiphenylethylene-2,2'-disulfonic acidCAS No: 81-11-8 EINECS ... No: 201-325-2Chemical name:4,4'-diamino-stilbene-2,2'-disulphonic acid Molecular formula:C14H14N2O6S2Properties: Appearance ... % maxInsoluble matter in alkali0.1% maxMoisture2% maxChroma9°max DSD acid (4,4'-Diaminodiphenylethylene-2,2'-disulfonic acid)