| S.No | Name of Impurity | CAS No. |
| Rifaximin Impurity (BP/EP) | ||
| 1 | 4-Methylpyridin-2-amine Impurity-A (BP/EP) | 695-34-1 |
| 2 | Rifamycin SV Impurity-C (BP/EP) | 6998-60-3 |
| 3 | Rifamycin-S Impurity-E (BP/EP) | 13553-79-2 |
| 4 | Impurity-G (BP/EP) | 13553-79-2 |
| 5 | 25-Desacetyl Rifaximin (In-house) | 80621-88-1 |
| 6 | 25-Desacetyl Rifamycin-S (In-house) | 17555-51-0 |
| Imatinib Mesylate Impurity (EP/BP) | ||
| 1 | (2E)-3-(dimethyl amino)1- (pyridin-3-yl)prop-2-en-1-one (Impurity-A), (BP/EP) | 123367-26-0 |
| 2 | 4-methyl-N-{4-(pyridin-3-yl) pyrimidin-2-yl}benzene-1,3-diamine (Impurity-F), (BP/EP) | 152460-10-1 |
| 3 | N-(2-methyl-5-nitro phenyl) 4-pyridin-3-yl) pyrimidin-2- amine (In- house) | 152460-09-8 |
| 4 | 1-(pyridin-3-yl) ethan-1-one (Impurity-H), (BP/EP) | 350-03-8 |
| Lenalidomide Impurity | ||
| 1 | Methyl nitro benzoic acid (In- house) | 96-98-0 |
| 2 | Methyl nitro-benzoate (In- house) | 59382-59-1 |
| 3 | Bromo methyl nitro benzoate (In- house) | 98475-07-1 |
| 4 | Nitro Lenalidomide (In- house) | 8227026-45-9 |
| 5 | Amino piperidinedione hydrochloride (In- house) | 24666-56-6 |
| Pinaverium Bromide Impurity | ||
| 1 | 1-bromo-2-(bromo methyl)- 4,5-di methoxy benzene (In- house) | 53207-00-4 |
| 2 | 4-{2-[2-(6,6-Di methyl bi cyclo [3.1.1]hept-2-yl)ethoxy] ethyl}morpholine | 38284-47-8 |
| 3 | De-hydro pinavarium Bromide (In- house) | 1235355-01-7 |
| 4 | 4-(2-bromo-4,5-di methoxy benzyl)-4-(2-chloroethyl) morpholin-4-ium Bromide (In- house) | NA |
| 5 | (2-bromo-4,5-di methoxy phenyl) methanol (In- house) | 54370-00-2 |
| Sorafenib Tosylate Impurity | ||
| 1 | 4-(4-amino phenoxy) -N-methylpyridine- 2-carboxamide (In- house) | 284462-37-9 |
| 2 | N-methyl-4- phenoxy pyridine- 2-carboxamide (In- house) | 2004659-85-0 |
| 3 | N-methyl-4-[4-({[3- (trifluoromethyl) phenyl] carbamoyl} amino)phenoxy] pyridine- 2-carboxamide (In- house) | 1285533-84-7 |
| 4 | 4-[4-({[2-chloro-3- (trifluoromethyl)phenyl]carbamoyl}amino) phenoxy]-N-methylpyridine-2-carboxamide (In- house) | 1431697-81-2 |
| 5 | 1,3-bis[4-chloro-3-(trifluoromethyl)phenyl]urea (In- house) | 370-50-3 |
| 6 | 4-chloro-N-methylpyridine-2-carboxamide | 220000-87-3 |
| 7 | 4-[4-({[4-chloro-3-(trifluoromethyl)phenyl]carbamoyl}amino)phenoxy]pyridine-2- carboxamide | 284461-71-1 |
| 8 | N-methyl-4-(4-{[2-(methyl carbamoyl) pyridin-4- yl]amino}phenoxy) pyridine- 2-carboxamide | NA |
| 9 | 4-chloro-3-(trifluoromethyl)aniline | 320-51-4 |
| Erlotinib Hydrochloride Impurity | ||
| 1 | 2- Amino-4,5-bis (2-methoxy ethoxy benzonitrile (In- house) | 950596-58-4 |
| 2 | 4,5-bis (2-methoxy ethoxy -2- nitro benzonitrile | 236750-65-5 |
| 3 | 6-O-Desmethyl Erlotinib (In- house) | 183321-86-0 |
| 4 | 7-O-Desmethyl Erlotinib | 183320-29-8 |
| 5 | Di desmethyl Erlotinib | 183320-29-8 (HCl) |