product name​：4,4'-dihydroxy-7,7'-ureylenedi(naphthalene-2-sulphonic acid
CAS RN：134-47-4
EINECS NO.：205-142-9
Molecular formula：C₂₁H₁₆N₂O₉S₂
Molecular weight:504.4897
Structural formula:

Uses: azo dyes intermediates used for the manufacture of direct orange S, etc. Direct Fast Scarlet 4BS