sulfonamides

Amides of sulfonic acidsRS(=O)2NR'2, e.g. PhS(=O)2NHCH3N-methylbenzenesulfonamide.
Source:
PAC, 1995, 67, 1307 (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1369