Analogues of acyclic carboxylic acid anhydrides in which =O
has been replaced by =NR
-imidoyl amidines. The name 1,3,5-triazapentadienes is sometimes applied as a class name to diamidides.
See: acid anhydrides, imidines
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1331 (https://doi.org/10.1351/pac199567081307)