… Isotopes other than those of heading 28.44; compounds, inorganic or organic, of such isotopes, whether or not chemically defined. …
Explanatory notes
… ‑ Isotopes other than those of heading 28.44; compounds, inorganic or organic, of such isotopes, whether or not … isotopes, that is, non‑radioactive isotopes and their inorganic or organic compounds, whether or not chemically …