H2NS(=O)2OH (sulfamic acid) and its N-@H02891@ 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 [Terms] [Paper]