Main Page | See live article | Alphabetical index Sulfhydryl, also called thiol, is contained in a reduced state within coenzyme A, lipoamide, glutathione, cysteine, and mercaptans. The listing for sulfhydryl is denoted as -SH. The above would be listed as R-SH. Radical -SH. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.