Thiol Definition

This is the chemical structure of cysteine.
This is the chemical structure of the thiol compound cysteine. Todd Helmenstine

Definition: Thiol is an organic sulfur compound composed of an alkyl or aryl group and a sulfur-hydrogen group.

General formula: R-SH where R is an alkyl or aryl group.

The S-H group is also known as a thiol group.

Also Known As: mercaptan

Examples: The amino acid cysteine is a thiol.