Quinapril

EP Imp-I

Risperidone

3-[2-[4-[(E)-(2,4-Difluorophenyl)(hydroxyimino)
methyl]-1-piperidinyl]ethyl]-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one

691007-09-7

Z-oxime (EP Imp-B)

Rizatriptan

2-(5-((5-((1H-1,2,4-Triazol-1-yl) methyl)-3-(2-(dimethylamino)ethyl)-1H-indol-2-yl)methyl)-1H-indol-3-yl)-N,N-dimethylethanamine benzoate

Rizatriptan

1-(4-((1H-1,2,4-Triazol-1-yl)methyl)phenyl)hydrazine hydrochloride

Rizatriptan

4,4-Bis(5-((1H-1,2,4-triazol-1-yl)methyl)-3-(2-(dimethylamino)ethyl)-1H-indol-2-yl)-N,N-dimethylbutan-1-amine

1135479-44-5

2,2-Dimer

Rizatriptan

4-(5-((1H-1,2,4-Triazol-1-yl)methyl)-3-(2-(dimethylamino)
ethyl)-1H-indol-1-yl)-4-(5-((1H-1,2,4-triazol-1-yl)methyl)-3-(2-(dimethylamino)ethyl)-1H-indol-2-yl)-N,N-dimethylbutan-1-amine

1135479-41-2

1,2-Dimer

Ritonavir

Ritonavir impurity-E

IMP-E

Simvastatin

(1S,2S,6R,8S,8aR)-1,2,6,7,8,8a-Hexahydro-1-(2-((R)-3,6-dihydro-6-oxo-2H-pyran-2-yl)ethyl)-2,6-dimethylnaphthalen-8-yl 2,2-dimethylbutanoate

IMP-C

Simvastatin

Simvastatin dimer

476305-24-5

Dimer or
IMP-D

Sertraline

(R)-4-(3,4-dichlorophenyl)-3,4-dihydronaphthalen-1(2H)-one

Tetralone (EP Imp-F)

Sertraline

(R)-2-Hydroxy-2-phenylacetic acid

IMP-E

Sildenafil citrate

4-Ethoxy-3-(6,7-dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzene-1-sulfonyl chloride

sulfonylchloride

Sildenafil

4-Ethoxy-3-(6,7-dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonic acid

Sulfonic acid (EP Imp-D)

Sildenafil

Sildenafil dimer

Piperazine dimer

Sildenafil

5-[2-Hydroxy-5-(4-methyl
piperazinylsulphonyl) phenyl]1-methyl-3-n-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyramidin-7-one

Hydroxy (EP Imp-C)

Sildenafil

5-(2-Ethoxyphenyl) -1-methyl-3-propyl-1,6-dihydro-7H-pyrazole[4,3-d]pyrimidine-7-one 

139756-21-1

Ethoxy phenyl (ED-V) imp

Sildenafil

5-[2-Ethoxy-5-[(4-methyl-4-oxido-1-piperazinyl) sulfonyl]phenyl]-1,6-dihydro-1-methyl-3-(2-methylpropyl)-7H-pyrazolo[4,3-d]pyrimidin-7-one

EP imp-A

Sildenafil 

Citrate O,N – Diethyl Impurity

Sildenafil

O,O – Diethyl Impurity

Sildenafil

5-(2-Hydroxyphenyl) -1-methyl-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-7(6H)-one

O-Desethylated
ethoxy phenyl imp

Sumatriptan

1-[3-[2-(Dimethylamino)ethyl]-2-[[3-[2-(dimethylamino) ethyl]-1H-indol-5-yl]methyl] -1H-indol-5-yl]-N-methylmethanesulfonamide

545338-89-4

EP Imp-A

Sumatriptan

1-[3-[2-(Dimethylamino)ethyl]-1-[[3-[2-(dimethylamino)ethyl]-1H-indol-5-yl]methyl]indol-5-yl]-N-methylmethanesulfonamide

EP Imp-H

Sumatriptan)

N,N-Dimethyl-2-[5-[(methylsulphamoyl) methyl]-1H-indol-3-yl]ethanamine N-oxide

212069-94-8

Imp-D(N-Oxide

Telmisartan

Benzimidazole N-Hydroxy imp

Telmisartan

Dibromo TBB ester

Telmisartan

EP Imp-E

Telmisartan

Decarboxylated imp

Trazodone

1-Allyl-4-(3-chlorophenyl)piperazine

Alkene imp of MCCP

Trazodone

2-(3-(4-(2-Chlorophenyl)piperazin-1-yl)propyl)-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one

Orthotrazodone

Trazodone

2-(3-(4-(4-Chlorophenyl)piperazin-1-yl)propyl)-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one

paratrazodone

Tamsulosin

4-[(4-Methyl-1-Piperazinyl)methyl]-N-[4-Methyl-3-[4-(3-Pyridinyl) -2-Pyrimidinyl] chloromethyl,amino] phenyl]benzamide

Aldehyde (EP Imp-E)

Tadalafil

(6S,12aS)-6-(1,3-Benzodioxol-5-yl)-2,3,6,7,12,12a-hexahydro-2-methyl-pyrazino[1',2':1,6]
pyrido[3,4-b]indole-1,4-dione

629652-72-8

L-Tadalafil (EP Imp-B)

Tadalafil

(1R,3R)-methyl 1-(benzo[d][1,3]
dioxol-5-yl)-2-(2-chloroacetyl) -2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-3-carboxylate

Chloro acetyl imp

Tadalafil

(1R,3R)-methyl 1-(benzo[d][1,3]dioxol-5-yl)-2-(2-(dimethylamino)acetyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-3-carboxylate

Dimethylamino imp

Tadalafil

5-allylbenzo[d][1,3]dioxole

Safrole imp

Tadalafil

Desmethyl impurity

Tolmetin Sodium

5-Methyl isomer

Tenofovir

Isopropyl impurity

Tenofovir

Tenofovir dimer

Dimer

Tenofovir

Dimer & mixed dimer

Tenofovir

Tenofovir Mixed dimer impurity

Mixed dimer

Tenofovir

Tenofovir mono Poc dimer

Mono poc dimer

Tenofovir

Tenofovir carbonyl impurity

Carbonyl imp

Temazepam

(Z)-7-Chloro-3-methoxy-1-methyl-5-phenyl-1H-benzo[e][1,4]diazepin-2(3H)-one

Imp-D

Valacyclovir

Valacyclovir impurity-P(Dimer)

EP imp-P (Dimer)

Valgancyclovir

Valgancyclovir impurity-j

Impurity-J

Verapamil.HCl

(3,4-dimethoxyphenyl)methanol

93-03-8

EP Imp-E

Varenicline

Varenicline cyclo impurity

Cyclo imp

Varenicline

Varenicline N-methyl impurity

N-Methyl

Varenicline

Varenicline N-formyl impurity

N-Formyl

Zolmitriptan

(S)-4-((3-(2-aminoethyl)-1H-indol-5-yl)methyl)oxazolidin-2-one

Zolmitriptan

(S)-1-[2(Dimethylamino)
ethyl]6,6a,7,11-tetrahydrooxazolo[3,4-b]pyrrol][2,3-b]isoquinolin-9(3H)-one

N/A

USP RC-C

Zolmitriptan

(R)-4-((3-(2-(Dimethylamino)ethyl )-1H-indol-5-yl)methyl)oxazolidin-2-one

R-isomer

Zolmitriptan

(S)-4-((3-(2-Aminoethyl)-1H-indol-5-yl)methyl)oxazolidin-2-one

139264-17-8

Amine Imp

Zolmitriptan

(S)-2-Amino-3-(4-nitrophenyl)propanoic acid

906813-62-5

4-Nitro-L-phenylalanine

Zolmitriptan

(R)-2-Amino-3-(4-nitrophenyl)propanoic acid

4-Nitro-D-phenylalanine

Zolmitriptan

(S)-4-((3-(2-(Methylamino)ethyl)-1H-indol-5-yl)methyl)oxazolidin-2-one

139264-35-0

Desmethyl(USP RC-A)

Zidovudine

1-((2R,5R)-Tetrahydro-4-hydroxy-5-(hydroxymethyl)furan-2-yl)-5-methylpyrimidine-2,4(1H,3H)-dione

50-89-5

Thymidine impurity