Explanatory notes
… atoms of the –NH 2 group by acid radicals. This heading excludes , however, urea (H 2 NCONH 2 ), the diamide of … Ethyl carbamate (urethan). (5) Glutamine . This heading excludes 1-cyanoguanidine (dicyandiamide) ( heading 29.26 ). … (C 14 H 20 ClNO 2 ). This heading excludes , however, heterocyclic ureides, e.g., malonylurea …