hydrazidines

Also contains definition of: hydrazide hydrazones

Compounds, RC(NHNH2)2=NNH2, derived from carboxylic acids by replacing –OH by –NHNH2 (or N-substituted analogues) and =O by =NNH2 (or substituted analogues). A specific hydrazidine is named as a hydrazide hydrazone, e.g. hexanohydrazide hydrazone.
Source:
PAC, 1995, 67, 1307 (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1341