Guidance
Drug precursor chemicals: category and CN codes
Published 8 May 2026
© Crown copyright 2026
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Category 1: Table I of the 1988 UN Convention
| Substance | CN code |
|---|---|
| 1-phenyl-2-propanone (BMK) | 2914 3100 |
| 3-4 Methylenedioxy-Phenylpropan-2-one (PMK) | 2932 9200 |
| Alpha-phenylacetoacetonitrile (APAAN) | 2926 4000 |
| Chloroephedrine | 2939 7990 |
| Chloropseudoephedrine | 2939 7990 |
| Ephedrine | 2939 4100 |
| Ergometrine | 2939 6100 |
| Ergotamine | 2939 6200 |
| Isosafrole | 2932 9100 |
| Lysergic Acid | 2939 6300 |
| N-acetylanthranilic Acid | 2924 2300 |
| Norephedrine | 2939 4400 |
| Piperonal | 2932 9300 |
| Pseudoephedrine | 2939 4200 |
| Safrole | 2932 9400 |
| 4-anilino-N-phenethylpiperidine/ ‘N-phenyl-1-(2 phenylethyl)piperidin-4-amine (ANPP) | 2933 3600 |
| N-phenethyl-4-piperidone/‘1-(2-phenylethyl)piperidin-4-one (NPP) | 2933 3700 |
| Methyl 3-(1,3-benzodioxol-5-yl)-2- methyloxirane-2-carboxylate (PMK methyl glycidate) | 2932 9900 |
| 3-(1,3-benzodioxol-5-yl)-2-methyloxirane-2-carboxylic acid (PMK glycidic acid) | 2932 9900 |
| Alpha-phenylacetoacetamide (APAA) | 2924 2970 |
| Methyl alpha-phenylacetoacetate (MAPA) | 2918 3000 |
| Methyl 2-methyl-3-phenyloxirane-2-carboxylate (BMK methyl glycidate) | 2918 9990 |
| 2‐methyl-3-phenyloxirane-2- carboxylic acid (BMK glycidic acid) | 2918 9990 |
| Diethyl (phenylacetyl) propanedioate (DEPAPD)[footnote 1] | 2918 30 00 |
| Ethyl3-(2H-1,3-benzodioxol-5-yl)-2-methyloxirane-2-carboxylate (PMK ethyl glycidate)[footnote 1] | 2932 99 00 |
| N-phenylpiperidin-4-amine (4-AP) [footnote 1] | 2933 39 99 |
| Tert-butyl 4-anilinopiperidine-1-carboxylate (1-boc-4-AP)[footnote 1] | 2933 39 99 |
| N-phenyl-N-(piperidin-4-yl)propenamide (norfentanyl)[footnote 1] | 2933 39 99 |
Category 2A: Table I of the 1988 UN Convention
| Substance | CN code |
|---|---|
| Acetic Anhydride | 2915 2400 |
| Red Phosphorous[footnote 1] | 2804 7000 |
Category 2B
Table I
| Substance | CN code |
|---|---|
| Phenylacetic Acid | 2916 3400 |
| Potassium Permanganate | 2916 3400 |
Table II
| Substance | CN code |
|---|---|
| Anthranilic Acid | 2922 4300 |
| Piperidine | 2933 3200 |
Category 3: Table II of the 1988 UN Convention
| Substance | CN code |
|---|---|
| Acetone | 2914 1100 |
| Ethyl Ether | 2909 1100 |
| Hydrochloric Acid | 2806 1000 |
| Methyl Ethyl Ketone (MEK) | 2914 1200 |
| Sulphuric Acid | 2807 0000 |
| Toluene | 2902 3000 |
Category 4: medicinal preparations of category 1 substances
| Substance | CN code |
|---|---|
| Ephedrine | 3004 4100 |
| Pseudoephedrine | 3004 4200 |