Montelukast

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Pharmaceutical Reference Standards

Montelukast

CAT. No.	CP-M25000
CAS. No.	158966-92-8
Mol. F.	C35H36ClNO3S
Mol. Wt.	586.19
Stock Status:	Custom Synthesis

Rel. Cas No: 151767-02-1 (Na salt) ; 577953-87-8 (K salt) ; 577953-88-9

Montelukast EP Impurity A

CAT. No.	CP-M25001
CAS. No.	190078-45-6
Mol. F.	C35H35ClNNaO3S
Mol. Wt.	608.17
Stock Status:	Custom Synthesis

Rel. Cas No: 220927-27-5 (free base)

Montelukast EP Impurity B

CAT. No.	CP-M25002
CAS. No.	918972-54-0
Mol. F.	C35H34ClNO2S
Mol. Wt.	568.17
Stock Status:	In Stock

Rel. Cas No: 1146137-52-1 (Na salt)

Montelukast EP Impurity C

CAT. No.	CP-M25003
CAS. No.	909849-96-3
Mol. F.	C35H36ClNO4S
Mol. Wt.	602.19
Stock Status:	In Stock

Rel. Cas No: 909796-71-0 (Na salt)

Montelukast EP Impurity D

CAT. No.	CP-M25004
CAS. No.	1187586-61-3
Mol. F.	C41H46ClNO5S2
Mol. Wt.	732.4
Stock Status:	Custom Synthesis

Montelukast EP Impurity E

CAT. No.	CP-M25005
CAS. No.	1187586-58-8
Mol. F.	C41H46ClNO5S2
Mol. Wt.	732.39
Stock Status:	Custom Synthesis

Montelukast EP Impurity F

CAT. No.	CP-M25006
CAS. No.	937275-23-5
Mol. F.	C34H32ClNO3S
Mol. Wt.	570.14
Stock Status:	Custom Synthesis

Montelukast EP impurity G

CAT. No.	CP-M25007
CAS. No.	774538-96-4
Mol. F.	C35H36ClNO3S
Mol. Wt.	586.18
Stock Status:	In Stock

Rel. Cas No: 1428448-96-7 (Na salt)

Montelukast EP Impurity H

CAT. No.	CP-M25008
CAS. No.	851755-56-1
Mol. F.	C34H32ClNO4S
Mol. Wt.	586.14
Stock Status:	Custom Synthesis

Rel. Cas No: 2244776-97-2 (Na salt) ; 906107-37-7 (HCl salt)

Montelukast EP Impurity I

CAT. No.	CP-M25009
CAS. No.	2045402-27-3
Mol. F.	C35H36ClNO4S
Mol. Wt.	602.19
Stock Status:	In Stock

Montelukast Sulfone

CAT. No.	CP-M25010
CAS. No.	1266620-74-9
Mol. F.	C35H36ClNO5S
Mol. Wt.	618.18
Stock Status:	Custom Synthesis

Montelukast EP Impurity D+E

CAT. No.	CP-M25011
CAS. No.	1242260-05-4
Mol. F.	C41H46ClNO5S2
Mol. Wt.	732.39
Stock Status:	In Stock

Montelukast R-Sulfoxide

CAT. No.	CP-M25012
CAS. No.	1152185-58-4
Mol. F.	C35H36ClNO4S
Mol. Wt.	602.19
Stock Status:	Custom Synthesis

Rel. Cas No: 1250264-16-4 (sodium salt)

Montelukast 1,2-Diol

CAT. No.	CP-M25013
CAS. No.	186352-97-6
Mol. F.	C35H36ClNO4S
Mol. Wt.	602.19
Stock Status:	Custom Synthesis

Montelukast Sodium

CAT. No.	CP-M25014
CAS. No.	151767-02-1
Mol. F.	C35H35ClNNaO3S
Mol. Wt.	608.17
Stock Status:	In Stock

Rel. Cas No: 158966-92-8 (free base) ; 577953-87-8 (K salt) ; 577953-88-9 (Dicyclohexylamine salt)

Montelukast (3S)-Hydroxy Benzoate

CAT. No.	CP-M25015
CAS. No.	142569-69-5
Mol. F.	C28H24ClNO3
Mol. Wt.	457.95
Stock Status:	In Stock

Montelukast Dicyclohexylamine

CAT. No.	CP-M25016
CAS. No.	577953-88-9
Mol. F.	C35H36ClNO3S : C12H23N
Mol. Wt.	586.2 : 181.3
Stock Status:	In Stock

Rel. Cas No: 151767-02-1 (Na salt) ; 577953-87-8 (K salt) ; 158966-92-8 (free base)

Montelukast Ether Impurity

CAT. No.	CP-M25017
CAS. No.	168214-67-3
Mol. F.	C29H26ClNO
Mol. Wt.	439.98
Stock Status:	Custom Synthesis

Montelukast Mercapto Acid Impurity

CAT. No.	CP-M25018
CAS. No.	162515-68-6
Mol. F.	C6H10O2S
Mol. Wt.	146.2
Stock Status:	Custom Synthesis

Rel. Cas No: 952585-15-8 (Na salt) ; 952585-16-9 (K salt)

Montelukast Methoxymethoxy Impurity

CAT. No.	CP-M25019
CAS. No.	184764-27-0
Mol. F.	C37H40ClNO5S
Mol. Wt.	646.24
Stock Status:	Custom Synthesis

Montelukast Nitrile Impurity

CAT. No.	CP-M25020
CAS. No.	866923-62-8
Mol. F.	C35H35ClN2OS
Mol. Wt.	567.19
Stock Status:	Custom Synthesis

Montelukast (3R)-Hydroxy Benzoate

CAT. No.	CP-M25021
CAS. No.	150026-72-5
Mol. F.	C28H24ClNO3
Mol. Wt.	457.95
Stock Status:	Custom Synthesis

Montelukast (3R)-Hydroxy Propanol

CAT. No.	CP-M25022
CAS. No.	150026-75-8
Mol. F.	C29H28ClNO2
Mol. Wt.	458
Stock Status:	Custom Synthesis

Montelukast (3RS)-Hydroxy Propanol

CAT. No.	CP-M25023
CAS. No.	959235-68-8
Mol. F.	C29H28ClNO2
Mol. Wt.	458
Stock Status:	Custom Synthesis

Montelukast (3S)-Hydroxy Methoxymethoxy Impurity

CAT. No.	CP-M25024
CAS. No.	184764-20-3
Mol. F.	C31H32ClNO4
Mol. Wt.	518.05
Stock Status:	Custom Synthesis

Montelukast (3S)-Hydroxy Methylketone

CAT. No.	CP-M25025
CAS. No.	184764-13-4
Mol. F.	C28H24ClNO2
Mol. Wt.	441.96
Stock Status:	Custom Synthesis

21(R)-Hydroxy Montelukast

CAT. No.	CP-M25027
CAS. No.	184763-26-6
Mol. F.	C35H36ClNO4S
Mol. Wt.	602.19
Stock Status:	Custom Synthesis

21(S)-Hydroxy Montelukast

CAT. No.	CP-M25028
CAS. No.	184763-29-9
Mol. F.	C35H36ClNO4S
Mol. Wt.	602.19
Stock Status:	Custom Synthesis

Montelukast 3-Oxo Benzoate

CAT. No.	CP-M25029
CAS. No.	149968-11-6
Mol. F.	C28H22ClNO3
Mol. Wt.	455.94
Stock Status:	Custom Synthesis

Montelukast Acid Methyl Ester

CAT. No.	CP-M25030
CAS. No.	855473-51-7
Mol. F.	C36H38ClNO3S
Mol. Wt.	600.21
Stock Status:	Custom Synthesis

Montelukast Acyl-β-D-Glucuronide Acetate

CAT. No.	CP-M25031
CAS. No.	188717-17-1
Mol. F.	C43H48ClNO11S
Mol. Wt.	822.36
Stock Status:	Custom Synthesis

Montelukast Disulfide Diacid Impurity

CAT. No.	CP-M25032
CAS. No.	162515-67-5
Mol. F.	C12H18O4S2
Mol. Wt.	290.39
Stock Status:	Custom Synthesis

Montelukast Disulfide Dimethyl Ester

CAT. No.	CP-M25033
CAS. No.	1446481-28-2
Mol. F.	C14H22O4S2
Mol. Wt.	318.45
Stock Status:	Custom Synthesis

Montelukast Chloroalcohol Impurity

CAT. No.	CP-M25034
CAS. No.	880769-28-8
Mol. F.	C29H27CI2NO
Mol. Wt.	476.44
Stock Status:	Custom Synthesis

Montelukast Dehydro Impurity

CAT. No.	CP-M25035
CAS. No.	168214-68-4
Mol. F.	C29H26ClNO
Mol. Wt.	439.98
Stock Status:	Custom Synthesis

Montelukast KSM-II Lactone Impurity

CAT. No.	CP-M25036
CAS. No.	162515-66-4
Mol. F.	C6H8OS
Mol. Wt.	128.19
Stock Status:	Custom Synthesis

Montelukast Thioglucolate Analog

CAT. No.	CP-M25037
CAS. No.	NA
Mol. F.	C45H56ClNO5S2
Mol. Wt.	790.52
Stock Status:	Custom Synthesis

Montelukast Impurity 21

CAT. No.	CP-M25038
CAS. No.	142542-48-1
Mol. F.	C29H28ClNO2
Mol. Wt.	458
Stock Status:	Custom Synthesis

Montelukast Ketocarbinol Impurity

CAT. No.	CP-M25039
CAS. No.	2682015-83-2
Mol. F.	C34H32ClNO4S
Mol. Wt.	586.1
Stock Status:	Custom Synthesis

Montelukast Ketone impurity

CAT. No.	CP-M25040
CAS. No.	1258428-71-5
Mol. F.	C29H26ClNO2
Mol. Wt.	455.98
Stock Status:	Custom Synthesis

Montelukast Lactone

CAT. No.	CP-M25041
CAS. No.	1100617-38-6
Mol. F.	C27H20ClNO2
Mol. Wt.	425.9
Stock Status:	Custom Synthesis

Montelukast Methyl Ether

CAT. No.	CP-M25042
CAS. No.	1351973-25-5
Mol. F.	C36H38ClNO3S
Mol. Wt.	600.2
Stock Status:	Custom Synthesis

Montelukast Racemate

CAT. No.	CP-M25043
CAS. No.	N220927-26-4
Mol. F.	C35H36ClNO3S
Mol. Wt.	586.2
Stock Status:	Custom Synthesis

Montelukast Impurity

CAT. No.	CP-M25044
CAS. No.	152922-86-6
Mol. F.	C7H11NO3S
Mol. Wt.	189.2
Stock Status:	Custom Synthesis

Montelukast Amide

CAT. No.	CP-M25045
CAS. No.	866923-63-9
Mol. F.	C35H37ClN2O2S
Mol. Wt.	585.2
Stock Status:	Custom Synthesis

Montelukast Dicarboxylic Acid

CAT. No.	CP-M25046
CAS. No.	213380-27-9
Mol. F.	C35H34ClNO5S
Mol. Wt.	616.2
Stock Status:	Custom Synthesis

Montelukast Dihydro Impurity

CAT. No.	CP-M25047
CAS. No.	142147-98-6
Mol. F.	C35H38ClNO3S : Na
Mol. Wt.	588.2 : 23.0
Stock Status:	Custom Synthesis

Rel. Cas No: 142147-67-9 (Free base)

Montelukast Impurity 1

CAT. No.	CP-M25048
CAS. No.	866923-64-0
Mol. F.	C6H9NS
Mol. Wt.	127.2
Stock Status:	Custom Synthesis

Rel. Cas No: 1003002-67-2 (Na salt)

Montelukast Impurity 3

CAT. No.	CP-M25049
CAS. No.	152922-71-9
Mol. F.	C6H9NO
Mol. Wt.	111.1
Stock Status:	Custom Synthesis

cis-Montelukast Sulfoxide

CAT. No.	CP-M25050
CAS. No.	1428448-97-8
Mol. F.	C35H35ClNO4S : Na
Mol. Wt.	601.2 : 23.0
Stock Status:	Custom Synthesis

Rel. Cas No: 1428511-42-5 (free base)

Montelukast Potassium

CAT. No.	CP-M25051
CAS. No.	577953-87-8
Mol. F.	C35H35ClNO3S : K
Mol. Wt.	585.2 : 39.1
Stock Status:	Custom Synthesis

Rel. Cas No: 158966-92-8 (free base) ; 151767-02-1 (Na salt) ; 577953-88-9 (Dicyclohexylamine salt)

Montelukast Impurity 8

CAT. No.	CP-M25052
CAS. No.	136476-38-5
Mol. F.	C7H14O6S2
Mol. Wt.	258.3
Stock Status:	Custom Synthesis

Montelukast Impurity 9

CAT. No.	CP-M25053
CAS. No.	807638-71-7
Mol. F.	C30H30ClNO4S
Mol. Wt.	536.1
Stock Status:	Custom Synthesis

Montelukast Impurity 11

CAT. No.	CP-M25054
CAS. No.	855473-50-6
Mol. F.	C7H11BrO2
Mol. Wt.	207.1
Stock Status:	Custom Synthesis

Montelukast Impurity 12

CAT. No.	CP-M25055
CAS. No.	3580-97-0
Mol. F.	C7H11Br3O2
Mol. Wt.	366.9
Stock Status:	Custom Synthesis

Montelukast S-Sulfoxide

CAT. No.	CP-M25056
CAS. No.	184763-44-8
Mol. F.	C35H36ClNO4S
Mol. Wt.	602.2
Stock Status:	Custom Synthesis

Montelukast Impurity 14

CAT. No.	CP-M25057
CAS. No.	120578-03-2
Mol. F.	C18H12ClNO
Mol. Wt.	293.8
Stock Status:	Custom Synthesis

Montelukast Impurity 15

CAT. No.	CP-M25058
CAS. No.	152922-72-0
Mol. F.	C8H11NOS
Mol. Wt.	169.2
Stock Status:	Custom Synthesis

Montelukast Dimer Impurity

CAT. No.	CP-M25059
CAS. No.	120578-04-3
Mol. F.	C28H18Cl2N2
Mol. Wt.	453.4
Stock Status:	Custom Synthesis

Montelukast Impurity 16

CAT. No.	CP-M25060
CAS. No.	149968-10-5
Mol. F.	C20H16ClNO
Mol. Wt.	321.8
Stock Status:	Custom Synthesis

Montelukast Impurity 18

CAT. No.	CP-M25061
CAS. No.	1351973-24-4
Mol. F.	C41H44ClNO4S2
Mol. Wt.	714.4
Stock Status:	Custom Synthesis

Montelukast Impurity 19

CAT. No.	CP-M25062
CAS. No.	181139-72-0
Mol. F.	C28H24ClNO3
Mol. Wt.	458
Stock Status:	Custom Synthesis

Montelukast Impurity 20

CAT. No.	CP-M25063
CAS. No.	287930-77-2
Mol. F.	C29H28ClNO2
Mol. Wt.	458
Stock Status:	Custom Synthesis

Montelukast Keto Carbinol Impurity

CAT. No.	CP-M25083
CAS. No.	NA
Mol. F.	C34H32ClNO4S
Mol. Wt.	586.14
Stock Status:	Custom Synthesis

Montelukast EP Impurity I Sodium Salt (Mixture of Diastereomers)

CAT. No.	CP-M25084
CAS. No.	NA
Mol. F.	C35H36ClNO4S : Na
Mol. Wt.	601.18 : 23.0
Stock Status:	Custom Synthesis

a b c d e f g h i j k l m n o p q r s t u v w x y z

Montelukast

Pharmaceutical Reference Standards

Montelukast

Montelukast EP Impurity A

Montelukast EP Impurity B

Montelukast EP Impurity C

Montelukast EP Impurity D

Montelukast EP Impurity E

Montelukast EP Impurity F

Montelukast EP impurity G

Montelukast EP Impurity H

Montelukast EP Impurity I

Montelukast Sulfone

Montelukast EP Impurity D+E

Montelukast R-Sulfoxide

Montelukast 1,2-Diol

Montelukast Sodium

Montelukast (3S)-Hydroxy Benzoate

Montelukast Dicyclohexylamine

Montelukast Ether Impurity

Montelukast Mercapto Acid Impurity

Montelukast Methoxymethoxy Impurity

Montelukast Nitrile Impurity

Montelukast (3R)-Hydroxy Benzoate

Montelukast (3R)-Hydroxy Propanol

Montelukast (3RS)-Hydroxy Propanol

Montelukast (3S)-Hydroxy Methoxymethoxy Impurity

Montelukast (3S)-Hydroxy Methylketone

21(R)-Hydroxy Montelukast

21(S)-Hydroxy Montelukast

Montelukast 3-Oxo Benzoate

Montelukast Acid Methyl Ester

Montelukast Acyl-β-D-Glucuronide Acetate

Montelukast Disulfide Diacid Impurity

Montelukast Disulfide Dimethyl Ester

Montelukast Chloroalcohol Impurity

Montelukast Dehydro Impurity

Montelukast KSM-II Lactone Impurity

Montelukast Thioglucolate Analog

Montelukast Impurity 21

Montelukast Ketocarbinol Impurity

Montelukast Ketone impurity

Montelukast Lactone

Montelukast Methyl Ether

Montelukast Racemate

Montelukast Impurity

Montelukast Amide

Montelukast Dicarboxylic Acid

Montelukast Dihydro Impurity

Montelukast Impurity 1

Montelukast Impurity 3

cis-Montelukast Sulfoxide

Montelukast Potassium

Montelukast Impurity 8

Montelukast Impurity 9

Montelukast Impurity 11

Montelukast Impurity 12

Montelukast S-Sulfoxide

Montelukast Impurity 14

Montelukast Impurity 15

Montelukast Dimer Impurity

Montelukast Impurity 16

Montelukast Impurity 18

Montelukast Impurity 19

Montelukast Impurity 20

Montelukast Keto Carbinol Impurity

Montelukast EP Impurity I Sodium Salt (Mixture of Diastereomers)