The cas register number of 1,2,3,4-Tetramethoxybenzene is 21450-56-6. It also can be called as Benzene,1,2,3,4-tetramethoxy- and the Systematic name about this chemical is 1,2,3,4-tetramethoxybenzene. 

Physical properties about 1,2,3,4-Tetramethoxybenzene are: (1)ACD/LogP: 1.41; (2)ACD/LogD (pH 5.5): 1.41; (3)ACD/LogD (pH 7.4): 1.41; (4)ACD/BCF (pH 5.5): 6.94; (5)ACD/BCF (pH 7.4): 6.94; (6)ACD/KOC (pH 5.5): 139.2; (7)ACD/KOC (pH 7.4): 139.2; (8)#H bond acceptors: 4; (9)#Freely Rotating Bonds: 4; (10)Polar Surface Area: 36.92Ų; (11)Index of Refraction: 1.483; (12)Molar Refractivity: 52.96 cm³; (13)Molar Volume: 185.4 cm³; (14)Polarizability: 20.99x10^-24cm³; (15)Surface Tension: 29.9 dyne/cm; (16)Enthalpy of Vaporization: 47.71 kJ/mol; (17)Vapour Pressure: 0.0209 mmHg at 25°C.

You can still convert the following datas into molecular structure:
(1)SMILES: O(c1c(OC)ccc(OC)c1OC)C
(2)InChI: InChI=1/C10H14O4/c1-11-7-5-6-8(12-2)10(14-4)9(7)13-3/h5-6H,1-4H3
(3)InChIKey: QCNHIJXDZKTWSA-UHFFFAOYAQ
(4)Std. InChI: InChI=1S/C10H14O4/c1-11-7-5-6-8(12-2)10(14-4)9(7)13-3/h5-6H,1-4H3
(5)Std. InChIKey: QCNHIJXDZKTWSA-UHFFFAOYSA-N