Hydrazine (diazane),
H2NNH2, and its hydrocarbyl derivatives. When one or more substituents are acyl groups, the compound is a hydrazide.
N-Alkylidene derivatives are hydrazones.
See: azines, hydrazo compounds
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1341 (https://doi.org/10.1351/pac199567081307)