NOC requirement for precursor chemicals: selected substances require authority permission for export, import, or both. The narcotics authority issues a NOC only for specified precursor chemicals and specifies whether permission applies to export, import or both; Acetic Anhydride is allowed for both export and import, Ephedrine and Pseudoephedrine (and salts) are listed as controlled precursors, Anthranilic Acid and certain ketone/oxidant precursors are subject to export only NOC, and Heliotropin and listed ergot alkaloid derivatives are subject to import only NOC.