| S No. | Category | Compound Name | Molecular Formula | Molecular Weight | CAS No. |
| 0 | A | Abiraterone N-oxide | C24H31NO2 | 365.22 | NA |
| 1 | A | Abiraterone ethyl ether | C26H35NO | 377.57 | NA |
| 2 | A | Abiraterone isopropyl ether | C27H37NO | 391.6 | NA |
| 3 | A | 3- Deoxy 3- chloro Abiraterone | C24H30ClN | 367.97 | NA |
| 4 | A | Abiraterone RC-8 | C28H38ClNO | 440.07 | NA |
| 5 | A | Aceclofenac impurity- G | C18H15Cl2NO6 | 412.33 | 1215709-75-3 |
| 6 | A | Aceclofenac tert-butyl ester | C20H21Cl2NO4 | 410.29 | 139272-68-7 |
| 7 | A | Aceclofenac impurity- A | C14H11Cl2NO2 | 0 | 15307-86-5 |
| 8 | A | Aceclofenac impurity- B | C15H13Cl2NO2 | 310.18 | 15307-86-5 |
| 9 | A | Aceclofenac impurity- C | C16H15Cl2NO2 | 324.21 | 15307-77-4 |
| 10 | A | Aceclofenac impurity- D | C17H15Cl2NO4 | 368.22 | 139272-66-5 |
| 11 | A | Aceclofenac impurity- E | C18H17Cl2NO4 | 382.55 | 139272-67-6 |
| 12 | A | Aceclofenac impurity- F | C23H19Cl2NO4 | 444.32 | NA |
| 13 | A | Acebutolol impurity- E | C16H26N2O3 | 294.4 | NA |
| 14 | A | Atenolol impurity- A | C8H9NO2 | 151.17 | 17194-82-0 |
| 15 | A | Atenolol impurity- C | C11H13NO3 | 207.23 | 29122-69-8 |
| 16 | A | Atenolol impurity- D | C14H21NO4 | 267.32 | 7146-68-1 |
| 17 | A | Atenolol impurity- E | C19H22N2O5 | 358.39 | 141650-31-9 |
| 18 | A | Atenolol impurity- F | C8H8O3 | 152.15 | 156-38-7 |
| 19 | A | Acetazolamide impurity- A | C4H4ClN3OS | 177.61 | 60320-32-3 |
| 20 | A | Acetazolamide impurity- C | C4H5N3OS2 | 175.23 | 32873-56-6 |
| 21 | A | Acetazolamide impurity- D | C2H4N4O2S2 | 180.21 | 14949-00-9 |
| 22 | A | Acetazolamide impurity- E | C4H5N3O4S2 | 223.23 | 827026-60-8 |
| 23 | A | Acetazolamide impurity- F | C8H9N7O6S4 | 427.46 | 80495-47-2 |
| 24 | A | Acetazolamide impurity- G | C2H3N3S2 | 133.19 | 2349-67-9 |
| 25 | A | Albendazole EP impurity- A | C10H13N3S | 207.3 | 80983-36-4 |
| 26 | A | Albendazole EP impurity- B | C12H15N3O3S | 281.34 | 54029-12-8 |
| 27 | A | Albendazole EP impurity- C | C12H15N3O4S | 297.34 | 75184-71-3 |
| 28 | A | Albendazole EP impurity- D | C10H13N3O2S | 239.3 | 80983-34-2 |
| 29 | A | Albendazole EP impurity- E | . | 0 | 10605-21-7 |
| 30 | A | Albendazole EP impurity- F | C10H11N3O2S | 237.28 | 80983-45-5 |
| 31 | A | Albendazole impuriy- 1. Di HCl | C9H14N2S. 2HCl | 228.29 | 66608-52-4 |
| 32 | A | Albendazole impuriy- 2 | C10H12N2S | 192.28 | NA |
| 33 | A | Albendazole impuriy- 3 | C9H12N2O2S | 212.27 | 54393-89-4 |
| 34 | A | Albendazole impuriy- 4 | C6H16N2O2 | 138.12 | 88-74-4 |
| 35 | A | Albendazole impuriy- 5 | C7H5N3O2S | 195.2 | 54029-45-7 |
| 36 | A | Allopurinol EP impurity - A, B, C, D, E | . | 0 | NA |
| 37 | A | Amlodipine EP impurity- A | C28H27ClN2O7 | 538.99 | 88150-62-3 |
| 38 | A | Amlodipine EP impurity- B | C29H32ClN3O7 | 570.05 | 721958-72-1 |
| 39 | A | Amlodipine EP impurity- C | C22H30ClN3O6 | 467.94 | 721958-74-3 |
| 40 | A | Amlodipine EP impurity- D | C20H23ClN2O5 | 406.86 | 113994-41-5 |
| 41 | A | Amlodipine EP impurity- E | C21H27ClN2O5 | 422.91 | 400024-12-6 |
| 42 | A | Amlodipine EP impurity- F | C19H23ClN2O5 | 394.86 | 400024-11-5 |
| 43 | A | Amlodipine EP impurity- G | C17H18ClNO4 | 335.79 | 43067-01-2 |
| 44 | A | Amlodipine EP impurity- 7 | C19H23ClN2O5 | 394.86 | NA |
| 45 | A | Amidarone EP impurity- A or USP RC- A. HCl | C25H32ClNO3 | 429.1 | 23551-25-9 |
| 46 | A | Amidarone EP impurity- B or USP RC- B | C23H26ClI2NO3 | 653.72 | 83409-32-9 |
| 47 | A | Amidarone EP impurity- C or USP RC- C | C25H31ClINO3 | 555.1 | 85642-08-6 |
| 48 | A | Amidarone EP impurity- D or USP RC- D | C19H16I2O3 | 546.1 | 1951-26-4 |
| 49 | A | Amidarone EP impurity- E or USP RC- E | C19H18O3 | 294.3 | 52490-15-0 |
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