azinic acids

Also contains definition of: nitronic acids
https://doi.org/10.1351/goldbook.A00558
Derivatives of the parent structure H2N+(O)OH, of which the alkylidene derivatives, R2C=N+(O)OH (tautomers of nitroalkanes), are the most commonly encountered. The alkylideneazinic acids are known as nitronic acids or, synonymously as @A00085@, e.g. CH2=N+(O)OH methylideneazinic acid.
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1321 [Terms] [Paper]