Section 06 Products of the chemical or allied 28 Inorganic chemicals; organic or inorganic compounds of precious metals, of rare earth metals, of radioactive elements or isotopes 28 45 Isotopes other than those of heading 2844; compounds, inorganic or organic, of such isotopes, whether or not chemically defined Commodity Code Description 28 45 10 - Heavy water (deuterium oxide) 28 45 20 -Boron enriched in boron-10 and its compounds 28 45 30 -Lithium enriched in lithium-6 and its compounds 28 45 40 -Helium-3 28 45 90 - Other