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