H2NS(=O)2OH (sulfamic acid) and its N-hydrocarbyl derivatives. Sulfamic acid is called sulfamidic acid in inorganic chemistry.
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1367 (https://doi.org/10.1351/pac199567081307)