… Isotopes other than those of heading 28.44; compounds, inorganic or organic, of such …
Explanatory notes
… 28.45 ‑ Isotopes other than those of heading 28.44; compounds, inorganic or organic, of such … whether or not chemically defined. The heading includes the following isotopes and their compounds : (1) Heavy … in 6,500. (2) Heavy water , which is deuterium oxide. Occurring in ordinary water at a level of 1 part in 6,500. …