is substituent group from hydrogen sulfide thiol group -SH 0 32.980 33.07394 CHEBI:26821 CHEBI:29916 CHEBI:29917 HS HS- Mercaptogruppe Merkaptogruppe Sulfhydrylgruppe Thiolgruppe chebi_ontology mercapto group sulfanyl sulfhydryl group sulphydryl group thiol thiol group inorganic group