Molecular structure of Dibenzo-24-crown-8 (CAS NO.14174-09-5) is:

Product Name: Dibenzo-24-crown-8
CAS Registry Number: 14174-09-5
Molecular Weight: 448.50608 [g/mol]  
Molecular Formula: C₂₄H₃₂O₈  
XLogP3: 2.1  
H-Bond Donor: 0  
H-Bond Acceptor: 8
Melting Point: 103-105 °C(lit.)
Index of Refraction: 1.479 
Molar Refractivity: 117.36 cm³ 
Molar Volume: 413.7 cm³
Surface Tension: 37.5 dyne/cm 
Density: 1.084 g/cm³ 
Flash Point: 235.5 °C 
Enthalpy of Vaporization: 84.97 kJ/mol 
Boiling Point: 591.5 °C at 760 mmHg 
Vapour Pressure: 2.42E-13 mmHg at 25°C 
EINECS: 238-027-7
Product Categories: Crown Ethers;Functional Materials;Macrocycles for Host-Guest Chemistry

Safty information about Dibenzo-24-crown-8 (CAS NO.14174-09-5) is:
Hazard Codes: Xi
Risk Statements: 36/37/38 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-36 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36:Wear suitable protective clothing.
WGK Germany: 3
HS Code: 29329995

 Dibenzo-24-crown-8 , its cas register number is 14174-09-5. It also can be called 6,7,9,10,12,13,20,21,23,24,26,27-Dodecahydrodibenz[b,n]-1,4,7,10,13,16,19,22-octaoxacyclotetracosane ; Dibenz[b,n][1,4,7,10,13,16,19,22]octaoxacyclotetracosin,6,7,9,10,12,13,20,21,23,24,26,27-dodecahydro- .It is a white powder.