IUPAC Name: 2-[4-[(E)-2-[4-(1,3-benzoxazol-2-yl)phenyl]ethenyl]phenyl]-1,3-benzoxazole 
Empirical Formula: C₂₈H₁₈N₂O₂
Molecular Weight: 414.4547g/mol
EINECS: 216-245-3 
Structure of Benzoxazole,2,2'-(1,2-ethenediyldi-4,1-phenylene)bis- (CAS NO.1533-45-5):

Index of Refraction: 1.731
Molar Refractivity: 129.29 cm³
Molar Volume: 323.4 cm³
Polarizability: 51.25×10^-24cm³
Surface Tension: 57.9 dyne/cm
Density: 1.281 g/cm³
Flash Point: 285.1 °C
Enthalpy of Vaporization: 81.94 kJ/mol 
Melting Point: >300 °C(lit.)
Boiling Point: 566.8 °C at 760 mmHg
Vapour Pressure: 2.79E-12 mmHg at 25°C 
Product Categories: Industrial/Fine Chemicals;Stilbenes;Building Blocks;Heterocyclic Building Blocks;Oxazoles 
Canonical SMILES: C1=CC=C2C(=C1)N=C(O2)C3=CC=C(C=C3)C=CC4=CC=C(C=C4)C5=NC6=CC=CC=C6O5
Isomeric SMILES: C1=CC=C2C(=C1)N=C(O2)C3=CC=C(C=C3)/C=C/C4=CC=C(C=C4)C5=NC6=CC=CC=C6O5
InChI: InChI=1S/C28H18N2O2/c1-3-7-25-23(5-1)29-27(31-25)21-15-11-19(12-16-21)9-10-20-13-17-22(18-14-20)28-30-24-6-2-4-8-26(24)32-28/h1-18H/b10-9+
InChIKey: ORACIQIJMCYPHQ-MDZDMXLPSA-N

Because Optical Brightener OB-1 (FBA 393) has strong fluorescence, it can not only improve the whiteness of the products but also can improve the brightness, so it can be used as disperse dyes in the chemical fiber, can be used like oil dissolving coloring agent in the plastics. Following is the usage:
1. Suitable for whitening and brightening polypropylene plastic, hard PVC, ABS, EVA, polystyrene, polycarbonate, etc.
2. Suitable for whitening chemical fibers, such as the polyester fiber, nylon fiber, polypropylene fiber and so on.
3. Suitable to be added into the conventional polymerization of polyester and nylon.
4. Especially suitable for whitening the plastics of elevated temperature compaction.

Hazard Codes: Xi
Risk Statements: 36/37/38 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-37/39-24/25 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S37/39:Wear suitable gloves and eye/face protection. 
S24/25:Avoid contact with skin and eyes.
WGK Germany: 1

  Benzoxazole,2,2'-(1,2-ethenediyldi-4,1-phenylene)bis- , its cas register number is 1533-45-5. It also can be called 2,2'-(Vinylenedi-4-phenylene)bis(benzoxazole) ;  2,2'-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole ; 2,2'-(Vinylenedi-p-phenylene)bisbenzoxazole .