Acid impurity

CAS No: 113844-99-8
Chemical Name:
3-((3-(N-(Isopropylcarbamoyl)sulfamoyl)pyridin-4-yl)amino)benzoic acid
Molecular Formula:
C16H18N4O5S

Hydroxy impurity

CAS No: 99300-68-2
Chemical Name:
4-((3-(Hydroxymethyl)phenyl)amino)-N-(isopropylcarbamoyl)pyridine-3-sulfonamide
Molecular Formula:
C16H20N4O4S

Para-Isomer

CAS No: 106944-63-2
Chemical Name:
N-(Isopropylcarbamoyl)-4-(p-tolylamino)pyridine-3-sulfonamide
Molecular Formula:
C16H20N4O3S

Ortho-Isomer

CAS No:  106944-62-1
Chemical Name:
N-(Isopropylcarbamoyl)-4-(o-tolylamino)pyridine-3-sulfonamide
Molecular Formula:
C16H20N4O3S

Impurity-1

CAS No: 164595-80-6
Chemical Name:
4-(o-Tolylamino)pyridine-3-sulfonamide
Molecular Formula:
C12H13N3O2S

Impurity-2

CAS No: 164595-81-7
Chemical Name:
4-(p-Tolylamino)pyridine-3-sulfonamide
Molecular Formula:
C12H13N3O2S

N-Oxide impurity

CAS No: 58154-83-9
Chemical Name:
3-(N-(Isopropylcarbamoyl)sulfamoyl)-4-(m-tolylamino)pyridine 1-oxide
Molecular Formula:
 C16H20N4O4S

EP-B/USP RCA

CAS No: 72811-73-5
Chemical Name:
4-[(3-methylphenyl)amino]pyridine-3-sulfonamide
Molecular Formula:
C12H13N3O2S

EP-C/USPRCC

CAS No: 58155-35-4
Chemical Name:
1-Ethyl-3-[[4-[(3-methylphenyl)amino]pyridin-3-yl]sulfonyl]urea
Molecular Formula:
C15H18N4O3S

EP-D/USP RCB

CAS No: 160972-33-8
Chemical Name:
1-Butyl-3-[[4-[(3-methylphenyl)amino]pyridin-3-yl]sulfonyl]urea
Molecular Formula:
C17H22N4O3S

EP-E/USP RCE

CAS No: 72810-57-2
Chemical Name:
Ethyl [[4-[(3-methylphenyl)amino]pyridin-3-yl]sulfonyl]carbamate
Molecular Formula:
C15H17N3O4S

Dimer

CAS No: NA
Chemical Name:
N,N'-carbonylbis(4-(m-tolylamino)pyridine-3-sulfonamide)
Molecular Formula:
C25H24N6O5S2

Reference standared

CAS No: 56211-40-6
Chemical Name:
1-(1-Methylethyl)-3-[[4-[(3-methylphenyl)amino]pyridin-3-yl]sulfonyl]urea
Molecular Formula:
C16H20N4O3S

EP-A/USP RCE

CAS No: 72810-61-8
Chemical Name:
4-(3-methylphenyl)-2H-pyrido[4,3-e]-1,2,4-thiadiazin-3(4H)-one 1,1-dioxide
Molecular Formula:
C13H11N3O3S