The Tungsten disulfide with the cas number 12138-09-9, is also called Tungsten(IV) sulfide. The IUPAC name is bis(sulfanylidene)tungsten. Its EINECS registry number is 235-243-3. This chemical is dark grey powder and belongs to the following product categories: (1)Inorganics; (2)ChalcogenidesChemical Synthesis; (3)Catalysis and Inorganic Chemistry; (4)Materials Science; (5)Metal and Ceramic Science; (6)Tungsten.

Properties Computed from Structure: (1)H-Bond Donor: 0; (2)H-Bond Acceptor: 0; (3)Rotatable Bond Count: 0; (4)Exact Mass: 247.895074; (5)MonoIsotopic Mass: 247.895074; (6)Topological Polar Surface Area: 64.2; (7)Heavy Atom Count: 3; (8)Formal Charge: 0; (9)Complexity: 18.3; (10)Isotope Atom Count: 0; (11)Defined Atom StereoCenter Count: 0; (12)Undefined Atom StereoCenter Count: 0; (13)Defined Bond StereoCenter Count: 0; (14)Undefined Bond StereoCenter Count: 0; (15)Covalently-Bonded Unit Count: 1.

When you are using this chemical, please be cautious about it as the following: (1)Irritating to eyes, respiratory system and skin; (2)In case of contact with eyes, rinse immediately with plenty of water and seek medical advice; (3)Wear suitable gloves and eye/face protection.

You can still convert the following datas into molecular structure:
(1)SMILES: [W](=S)=S
(2)InChI: InChI=1/2S.W/rS2W/c1-3-2 
(3)InChIKey: ITRNXVSDJBHYNJ-UHFFFAOYSA-N