The Benzene,1,4-diiodo-2,5-dimethoxy-, with the CAS registry number 51560-21-5, is also known as 2,5-Diiodo-1,4-dimethoxybenzene. This chemical's molecular formula is C₈H₈I₂O₂ and molecular weight is 389.96. What's more, its IUPAC name is 1,4-diiodo-2,5-dimethoxybenzene. When you are using this chemical, please be cautious about it. It may cause inflammation to the skin or other mucous membranes. 

Physical properties of Benzene,1,4-diiodo-2,5-dimethoxy- are: (1)ACD/LogP: 3.78; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 3.78; (4)ACD/LogD (pH 7.4): 3.78; (5)ACD/BCF (pH 5.5): 438.1; (6)ACD/BCF (pH 7.4): 438.1; (7)ACD/KOC (pH 5.5): 2706.69; (8)ACD/KOC (pH 7.4): 2706.69; (9)#H bond acceptors: 2; (10)#H bond donors: 0; (11)#Freely Rotating Bonds: 2; (12)Polar Surface Area: 18.46 Å²; (13)Index of Refraction: 1.64; (14)Molar Refractivity: 65.42 cm³; (15)Molar Volume: 181.5 cm³; (16)Polarizability: 25.93×10^-24cm³; (17)Surface Tension: 45.5 dyne/cm; (18)Density: 2.147 g/cm³; (19)Flash Point: 185.4 °C; (20)Enthalpy of Vaporization: 60.66 kJ/mol; (21)Boiling Point: 382.9 °C at 760 mmHg; (22)Vapour Pressure: 1.01E-05 mmHg at 25°C.

You can still convert the following datas into molecular structure:
(1)SMILES: Ic1cc(OC)c(I)cc1OC
(2)Std. InChI: InChI=1S/C8H8I2O2/c1-11-7-3-6(10)8(12-2)4-5(7)9/h3-4H,1-2H3
(3)Std. InChIKey: GLVOXVCTGAISRY-UHFFFAOYSA-N