Analogues of cyclic @A00072@ in which =O has been replaced by =NR and –O– by –NR–.
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See:
acid anhydrides
,
diamidides
Source: PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1342 [Terms] [Paper]