| Chapter Code | Chapter Description |
|---|
| 293319 | COMPOUNDS CONTAINING AN UNFUSED PYRAZOLE RING (WHETHER OR NOT HYDROGENATED) IN THE STRUCTURE) : OTHER |
| 293321 | COMPOUNDS CONTAINING AN UNFUSED IMIDAZOLE RING (WHETHER OR NOT HYDROGENATED) IN THE STRUCTURE : HYDANTOIN AND ITS DERIVATIVES |
| 293329 | COMPOUNDS CONTAINING AN UNFUSED IMIDAZOLE RING (WHETHER OR NOT HYDROGENATED) IN THE STRUCTURE : OTHER |
| 293331 | COMPOUNDS CONTAINING AN UNFUSED PYRIDINE RING (WHETHER OR NOT HYDROGENATED) IN THE STRUCTURE : PYRIDINE AND ITS SALTS |
| 293332 | COMPOUNDS CONTAINING AN UNFUSED PYRIDINE RING (WHETHER OR NOT HYDROGENATED) IN THE STRUCTURE : PIPERIDINE AND ITS SALTS |
| 293333 | COMPOUNDS CONTAINING AN UNFUSED PYRIDINE RING (WHETHER OR NOT HYDROGENATED) IN THE STRUCTURE : ALFENTANIL (INN), ANILERIDINE(INN), BEZITRAMIDE (INN), BROMAZEPAM (INN), DIFENOXIN(INN), DIPHENOXYLATE (INN), DIPIPANONE(INN), FENTANYL (INN), KETO BEMIDONE (INN), METHYLPHENIDATE (INN), PENTAZOCINE (INN), PETHIDINE(INN), PETHIDINE INTERMEDIATE A, PHENCYCLINDINE (INN) (PCP), PHENOPERIDINE (INN), PIPRADROL (INN), PIRITRAMIDE (INN), PROPIRAM (INN) AND TRIMEPERIDINE (INN; SALTS THEREOF |
| 293339 | OTHER: DERIVATIVES OF PYRIDINE |
| 293341 | COMPOUNDS CONTAINING IN THE STRUCTURE A QUINOLINE OR ISOQUINOLINE RING-SYSTEM (WHETHER OR NOT HYDROGENATED), NOT FURTHER FUSED : LEVORPHANOL (INN) AND ITS SALTS |