Explanatory notes
… by headings 29.30 and 29.31 are organic compounds whose molecules contain, in addition to atoms of hydrogen, oxygen … non-metals (such as sulphur, arsenic, lead, iron, etc.) directly linked to carbon. Heading 29.30 (organo-sulphur … Other This heading includes organo-sulphur compounds whose molecules have sulphur atom(s) directly linked to carbon …