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1. Acetic anhydride
2. N-Acetylanthranilic acid (2-acetamidobenzoic acid) and its salts
3. Anthranilic acid (2-aminobenzoic acid) and its salts
4. Ephedrine (l-erythro-2-(methylamino)-1-phenyl-propan-1-ol), its salts and any plant containing ephedrine or any of its salts
5. Ergometrine (9,10-didehydro-N-(2-hydroxy-1-methylethyl)-6-methylergoline-8-carboxamide) and its salts
6. Ergotamine (12'-hydroxy-2'-methyl-5'-(phenylmethyl)ergotaman-3',6', 18-trione) and its salts
7. Isosafrole (5-(1-propenyl)-1,3-benzodioxole)
8. Lysergic acid (9,10-didehydro-6-methylergoline-8-carboxylic acid) and its salts
9. 3,4-Methylenedioxyphenyl-2-propanone (1-(1,3-benzodioxole)-2-propanone)
10. Norephedrine (Phenylpropanolamine) and its salts
11. 1-Phenyl-2-propanone
12. Phenylacetic acid and its salts
13. 1Piperidine and its salts
14. Piperonal (1,3-benzodioxole-5-carboxaldehyde)
15. Potassium permanganate
16. Pseudoephedrine (d-threo-2-(methylamino)-1-phenyl-propan-1-ol) and its salts
17. Safrole (5-(2-propenyl)1,3-benzodioxole) and any essential oil containing more than 4% safrole
18. Gamma-butyrolactone (dihydro-2(3H)-furanone)
19. 1,4-butanediol
20. Red Phosphorus
21. White Phosphorus
22. Hypophosphorous acid, its salts and derivatives
23. Hydriodic acid

Note: Each Class A precursor includes synthetic and natural forms