primary amide organonitrogen compound organooxygen compound carboxamide 0 41.998 42.01680 An amide of a carboxylic acid, having the structure RC(=O)NR2. The term is used as a suffix in systematic name formation to denote the -C(=O)NH2 group including its carbon atom. CHEBI:35354 CHEBI:35355 CHEBI:37622 CNOR3 [*]C(=O)N([*])[*] carboxamides carboxamides chebi_ontology primary carboxamide