Explanatory notes
… lattice, the molecular species corresponds to the repeating unit cell. Separate chemically defined compounds containing … in the process and are principally the following : (a) Unconverted starting materials. (b) Impurities present in … are not in all cases regarded as “impurities” permitted under Note 1 (a). When such substances are deliberately left …Legal note
… only to : (a) Separate chemically defined organic compounds, whether or not containing impurities; (b) … of carbon mentioned in Note 2 to Chapter 28; (e) Immunological products of heading 30.02. (f) Urea …