In organic chemistry, a<unk>  is a compound that contains the functional group composed of a sulfur atom and a hydrogen atom (-SH). Being the sulfur analogue of an alcohol group (-OH), this functional group is referred to either as a<unk>  group or a sulfhydryl group. More traditionally,<unk> s are often referred to as mercaptans.
Thiol
Biotin
Heme
Famine
Organophosphorus
Flavin
Thiamin
Cholic acid