Explanatory notes
… X ORGANO-INORGANIC COMPOUNDS, HETEROCYCLIC COMPOUNDS, NUCLEIC ACIDS AND THEIR SALTS, AND SULPHONAMIDES GENERAL The … of metals or other non-metals (such as sulphur, arsenic, lead, iron, etc.) directly linked to carbon. Heading 29.30 … heterocyclic rings are specifically named at the subheading level, the compound should be classified in the specific …