Thiols are organic compounds that contain a sulfur atom bonded to a carbon atom and a hydrogen atom, represented by the general formula R-SH. They are similar to alcohols, which have an -OH group, but instead feature the -SH group. Thiols are known for their strong and often unpleasant odors, reminiscent of rotten eggs or garlic, due to the presence of sulfur. These compounds play important roles in various biological processes and are found in many natural substances, including cysteine, an amino acid essential for protein synthesis. Thiols are also used in industrial applications, such as in the production of rubber and as additives in petroleum products.