chemical structure of the thiol functional group
<a href="//commons.wikimedia.org/wiki/User:Vladsinger" title="User:Vladsinger">Vladsinger</a> , <a href="//commons.wikimedia.org/wiki/User:Bryan_Derksen" title="User:Bryan Derksen">User:Bryan Derksen</a>
2007-04-20
Own work  using: BKchem