... 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 No: 81-11 ... -8 EINECS No: 201-325-2Chemical name:4,4 ... .1% maxMoisture2% maxChroma9°max DSD acid (4,4'-Diaminodiphenylethylene-2,2'-disulfonic acid)