Explanatory notes
… - heading 29.29 ). Amides are compounds which contain the following characteristic groups : (–CONH 2 ) ((–CO) 2 NH) … the –NH 2 group by acid radicals. This heading excludes , however, urea (H 2 NCONH 2 ), the diamide of carbonic acid, … (C 14 H 20 ClNO 2 ). This heading excludes , however, heterocyclic ureides, e.g., malonylurea (barbituric …