Subheading 284510: Heavy Water (Deuterium Oxide)
Subheading 284520: Boron Enriched in Boron-10 and its Compounds
Subheading 284530: Lithium Enriched in Lithium-6 and its Compounds
Subheading 284540: Helium-3
Subheading 284590: Isotopes other than those of Heading no. 2844, 2845.20, 2845. … etc.