C5H5NS
C5H5NS is the molecular formula for several chemical compounds, most notably pyridine and its isomers. Pyridine itself is a basic heterocyclic organic compound with the chemical formula C5H5N. It is a six-membered ring with one nitrogen atom and five carbon atoms. Pyridine is a colorless liquid with a distinct, unpleasant odor. It is miscible with water and most organic solvents. Pyridine is used as a solvent and as a precursor to many other chemicals, including pharmaceuticals and agrochemicals.
The isomers of C5H5NS, where the sulfur atom replaces a carbon atom in the pyridine ring, are