IUPAC Name: 2,2-Dimethylpropanethioic S-acid 
Following is the structure of Thiopivalic acid (CAS NO.55561-02-9):
                      
Empirical Formula: C₅H₁₀OS
Molecular Weight: 118.1973 g/mol
EINECS: 259-708-5
Molar Refractivity: 33.1 cm³
Molar Volume: 122.2 cm³
Density: 0.966 g/cm³
Flash Point: 23.9 °C
Index of Refraction: 1.453
Surface Tension: 28.7 dyne/cm
Enthalpy of Vaporization: 36.38 kJ/mol
Boiling Point of Thiopivalic acid (CAS NO.55561-02-9): 126 °C at 760 mmHg
Vapour Pressure of Thiopivalic acid (CAS NO.55561-02-9): 11.9 mmHg at 25 °C
Canonical SMILES: CC(C)(C)C(=O)S
InChI: InChI=1S/C5H10OS/c1-5(2,3)4(6)7/h1-3H3,(H,6,7)
InChIKey: JHSXHKMJBWOMRU-UHFFFAOYSA-N

RIDADR: 2920
HazardClass: 8
PackingGroup: II

 Thiopivalic acid , its cas register number is 55561-02-9. It also can be called Propanethioic acid, 2,2-dimethyl- .