sulfenyl groups

https://doi.org/10.1351/goldbook.S06098
Groups having the structure RS– (R ≠ H). This term is derived from sulfenic acids. The synonymous term sulfanyl groups is derived from sulfane, H2S. E.g. CH3–S– methanesulfenyl, methylthio or methylsulfanyl.
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1368 (https://doi.org/10.1351/pac199567081307)