Definition of diamidides

1. Analogues of acyclic carboxylic acid anhydride in which =O has been replaced by =NR and -O- by -NR-: RC(=NR)NRC(=NR)R, N-imidoyl amidines. The name 1,3,5-triazapentadienes, formed in contravention of NOC Rule C-61, is sometimes applied as a class name to diamidides. See imidines .