nitrosamines

N-Nitroso amines, compounds of the structure R2NNO. Compounds RNHNO are not ordinarily isolable, but they, too, are nitrosamines. The name is a contraction of N-nitrosoamine and, as such, does not require the N locant.
See also: nitrosamides
Source:
PAC, 1995, 67, 1307 (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1352