List of drug precursors:

1. (1) Anthranilic acid and its salts;
2. (2) Benzyl cyanide;
3. (3) Ephedrine, its salts, optical isomers, and salts of optical isomers;
4. (4) Ergonovine and its salts;
5. (5) Ergotamine and its salts;
6. (6) N-Acetylanthranilic acid and its salts;
7. (7) Norpseudoephedrine, its salts, optical isomers, and salts of optical isomers;
8. (8) Phenylacetic acid and its salts;
9. (9) Phenylpropanolamine, its salts, optical isomers, and salts of optical isomers;
10. (10) Piperidine and its salts;
11. (11) Pseudoephedrine, its salts, optical isomers, and salts of optical isomers;
12. (12) 3,4-Methylenedioxyphenyl-2-propanone;
13. (13) Methylamine and its salts;
14. (14) Ethylamine and its salts;
15. (15) D-Lysergic acid, its salts, optical isomers, and salts of optical isomers;
16. (16) Propionic anhydride;
17. (17) Insosafrole (Isosafrole);
18. (18) Safrole;
19. (19) Piperonal;
20. (20) N-Methylephedrine, its salts, optical isomers, and salts of optical isomers (N-Methylephedrine);
21. (21) N-Ethylephedrine, its salts, optical isomers, and salts of optical isomers;
22. (22) N-Methylpseudoephedrine, its salts, optical isomers, and salts of optical isomers;
23. (23) N-Ethylpseudoephedrine, its salts, optical isomers, and salts of optical isomers; and
24. (24) Hydriotic acid (Hydriodic Acid).