The 2,3-Dibromo-4-methylthiophene, with cas registry number of 125257-38-7, has the systematic name 2,3-dibromo-4-methylthiophene. And its IUPAC name is the same one. Besides this, it is also named thiophene, 2,3-dibromo-4-methyl-.

Physical properties about this chemical are: (1)ACD/LogP: 3.80; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 3.8; (4)ACD/LogD (pH 7.4): 3.8; (5)ACD/BCF (pH 5.5): 453.82; (6)ACD/BCF (pH 7.4): 453.82; (7)ACD/KOC (pH 5.5): 2775.87; (8)ACD/KOC (pH 7.4): 2775.87; (9)#H bond acceptors: 0; (10)#H bond donors: 0; (11)#Freely Rotating Bonds: 0; (12)Polar Surface Area: 28.24 Å²; (13)Index of Refraction: 1.62; (14)Molar Refractivity: 44.84 cm³; (15)Molar Volume: 127.5 cm³; (16)Polarizability: 17.77×10^-24cm³; (17)Surface Tension: 44.2 dyne/cm; (18)Enthalpy of Vaporization: 45.9 kJ/mol; (19)Vapour Pressure: 0.0557 mmHg at 25°C.

You can still convert the following datas into molecular structure: 
(1)SMILES: Cc1csc(Br)c1Br
(2)InChI: InChI=1/C5H4Br2S/c1-3-2-8-5(7)4(3)6/h2H,1H3
(3)InChIKey: WBYLRMUZATVKLP-UHFFFAOYAR
(4)Std. InChI: InChI=1S/C5H4Br2S/c1-3-2-8-5(7)4(3)6/h2H,1H3
(5)Std. InChIKey: WBYLRMUZATVKLP-UHFFFAOYSA-N