91-34-9 4,4'-bis[(4-hydroxyphenyl)azo]stilbene-2,2'-disulphonic acid

product Name 4,4'-bis[(4-hydroxyphenyl)azo]stilbene-2,2'-disulphonic acid Synonyms Direct Yellow 4 dye; 5-(4-hydroxyphenyl)azo-2-[(E)-2-[4-(4-hydroxyphenyl)azo-2-sulfo-phenyl]vinyl]benzenesulfonic acid Molecular Formula C26H20N4O8S2 Molecular Weight 580.589 InChI InChI=1/C26H20N4O8S2/c31-23-11-7-19(8-12-23)27-29-21-5-3-17(25(15-21)39(33,34)35)1-2-18-4-6-22(16-26(18)40(36,37)38)30-28-20-9-13-24(32)14-10-20/h1-16,31-32H,(H,33,34,35)(H,36,37,38)/b2-1+,29-27u,30-28u CAS Registry Number 91-34-9 EINECS 202-062-6 Molecular Structure Density 1.5g/cm3 Refractive index 1.691 Hazard Symbols Risk Codes Safety Description