|Section2= |Section3= | Section8 = }} » For other uses of THT, see THT (disambiguation) Tetrahydrothiophene's a heterocyclic organic compound consisting of a five-membered ring containing four carbon atoms and a sulfur atom. It's the saturated analog of thiophene. It's a volatile, clear, colorless liquid with a strong unpleasant odor. Because of its smell, tetrahydrothiophene's occasionally used as an odorant in natural gas, in place of the more common ethanethiol. It's also used as a solvent,… (More on Tetrahydrothiophene)