This functional group is selectively stained by methylene orange. Aromatic versions are created in the Leuckhart reaction from diazonium salts, while compounds undergoing the Corey-Seebach reaction have been reacted with a protecting group containing two of them. In the catalytic cycle of ribonucleotide reductase, a radical is transferred from this functional group to an active site carbon, and one of these functional groups in GAPDH attacks the aldehyde group of glyceraldehyde-3-phosphate. These compounds can be synthesized by a reduction following the use of Lawesson's reagent. A version of ethanol with one of these functional groups added is used to denature proteins in protein gel electrophoresis, while papain and caspase are proteases that contain one of these functional groups at the active site. Notably present on the side chain of cysteine, they are also 
This functional group is selectively stained by methylene orange. Aromatic versions are created in the Leuckhart reaction from diazonium salts, while compounds undergoing the Corey-Seebach reaction have been reacted with a protecting group containing two of them. In the catalytic cycle of ribonucleotide reductase, a radical is transferred from this functional group to an active site carbon, and one of these functional groups in GAPDH attacks the aldehyde group of glyceraldehyde-3-phosphate. These compounds can be synthesized by a reduction following the use of Lawesson's reagent. A version of ethanol with one of these functional groups added is used to denature proteins in protein gel electrophoresis, while papain and caspase are proteases that contain one of these functional groups at the active site. Notably present on the side chain of cysteine, they are also present in skunk spray. For 10 points, name these compounds that can be synthesized from the SN2 reaction of an alkyl halide with hydrogen sulfide, the sulfur analogues of alcohols.
This functional group is selectively stained by methylene orange.
{Thiols} or {mercaptans} or {sulfhydryl}