Molecular structure of 4-Acetamido-5-hydroxynaphthalene-2,7-disulphonic acid (CAS NO.134-34-9) is:

Product Name: 4-Acetamido-5-hydroxynaphthalene-2,7-disulphonic acid
CAS Registry Number: 134-34-9
IUPAC Name: 4-Acetamido-5-hydroxynaphthalene-2,7-disulfonic acid
Molecular Weight: 361.34764 [g/mol]  
Molecular Formula: C₁₂H₁₁NO₈S₂  
XLogP3-AA: 0  
H-Bond Donor: 4  
H-Bond Acceptor: 8
Index of Refraction: 1.723 
Molar Refractivity: 79.56 cm³ 
Molar Volume: 200.6 cm³
Surface Tension: 95.4 dyne/cm 
Density: 1.801 g/cm³ 
EINECS: 205-139-2
Related Registry Number: 16698-16-1 (di-hydrochloride salt)
Product Categories: Intermediates of Dyes and Pigments
Canonical SMILES: CC(=O)NC1=C2C(=CC(=C1)S(=O)(=O)O)C=C(C=C2O)S(=O)(=O)O
InChI: InChI=1S/C12H11NO8S2/c1-6(14)13-10-4-8(22(16,17)18)2-7-3-9(23(19,20)21)5-11(15)12(7)10/h2-5,15H,1H3,(H,13,14)(H,16,17,18)(H,19,20,21) 
InChIKey: DACUJXBUANTBKE-UHFFFAOYSA-N

 4-Acetamido-5-hydroxynaphthalene-2,7-disulphonic acid , its cas register number is 134-34-9. It also can be called 4-(Acetylamino)-5-hydroxy-2,7-naphthalenedisulfonic acid ; 1-Acetamido-8-naphthol-3,6-disulfonic acid ; 2,7-Naphthalenedisulfonic acid, 4-(acetylamino)-5-hydroxy- .