91-34-9, CAS No 91-34-9

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
InChl	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

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