levothyroxine and its Impurities

A synthetic form of thyroid hormone, Thyroxine. Levothyroxine is used in the treatment of thyroid hormone deficiency and certain types of thyroid tumors. It is a levorotatory enantiomer of Thyroxine. Reference standards of Levothyroxine API,and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.

Displaying 45 results for levothyroxine Impurities
PAI 12 008258

Ethyl 2-(4-hydroxy-3,5-dinitrophenyl)acetate

Ethyl 2-(4-hydroxy-3,5-dinitrophenyl)acetate

  • Catalogue No.:PAI 12 008258

  • CAS :

    83799-60-4

  • Molecular Formula : C10H10N2O7

  • Molecular Weight : 270.2

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PAI 12 008259

Ethyl 2-(4-(4-methoxyphenoxy)-3,5-dinitrophenyl)acetate

Ethyl 2-(4-(4-methoxyphenoxy)-3,5-dinitrophenyl)acetate

  • Catalogue No.:PAI 12 008259

  • CAS :

    NA

  • Molecular Formula : C17H16N2O8

  • Molecular Weight : 376.32

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PAI 12 008260

Ethyl 2-(3,5-diamino-4-(4-methoxyphenoxy)phenyl)acetate

Ethyl 2-(3,5-diamino-4-(4-methoxyphenoxy)phenyl)acetate

  • Catalogue No.:PAI 12 008260

  • CAS :

    101588-11-8

  • Molecular Formula : C17H20N2O4

  • Molecular Weight : 316.36

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PAI 12 008261

2-(3,5-Diiodo-4-(4-methoxyphenoxy)phenyl)acetic Acid

2-(3,5-Diiodo-4-(4-methoxyphenoxy)phenyl)acetic Acid

  • Catalogue No.:PAI 12 008261

  • CAS :

    NA

  • Molecular Formula : C15H12I2O4

  • Molecular Weight : 510.07

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PAI 12 008262

2-(4-Hydroxy-3,5-dinitrophenyl)acetic Acid

2-(4-Hydroxy-3,5-dinitrophenyl)acetic Acid

  • Catalogue No.:PAI 12 008262

  • CAS :

    10463-37-3

  • Molecular Formula : C8H6N2O7

  • Molecular Weight : 242.14

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PAI 12 008263

3,5-Diiodo-4'-O-methyl Thyroacetic Acid Ethyl Ester

3,5-Diiodo-4'-O-methyl Thyroacetic Acid Ethyl Ester

  • Catalogue No.:PAI 12 008263

  • CAS :

    85828-82-6

  • Molecular Formula : C17H16I2O4

  • Molecular Weight : 538.12

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PAI 12 008264

(S)-2-((tert-Butoxycarbonyl)amino)-3-(4-(4-((4-hydroxycyclohexa-1,3-dien-1-yl)oxy)-3,5-diiodophenoxy)-3,5-diiodophenyl)propanoic Acid

(S)-2-((tert-Butoxycarbonyl)amino)-3-(4-(4-((4-hydroxycyclohexa-1,3-dien-1-yl)oxy)-3,5-diiodophenoxy)-3,5-diiodophenyl)propanoic Acid

  • Catalogue No.:PAI 12 008264

  • CAS :

    NA

  • Molecular Formula : C26H25I4NO7

  • Molecular Weight : 971.1

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PAI 12 008265

(S)-2-Amino-3-(4-(4-(4-hydroxyphenoxy)-3,5-diiodophenoxy)-3,5-diiodophenyl)propanoic Acid

(S)-2-Amino-3-(4-(4-(4-hydroxyphenoxy)-3,5-diiodophenoxy)-3,5-diiodophenyl)propanoic Acid

  • Catalogue No.:PAI 12 008265

  • CAS :

    NA

  • Molecular Formula : C21H15I4NO5

  • Molecular Weight : 868.97

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PAI 12 008266

Methyl (S)-2-((tert-butoxycarbonyl)amino)-3-(3-chloro-4-hydroxyphenyl)propanoate

Methyl (S)-2-((tert-butoxycarbonyl)amino)-3-(3-chloro-4-hydroxyphenyl)propanoate

  • Catalogue No.:PAI 12 008266

  • CAS :

    NA

  • Molecular Formula : C15H20ClNO5

  • Molecular Weight : 329.78

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PAI 12 008267

Methyl (S)-2-((tert-butoxycarbonyl)amino)-3-(4-(4-((tert-butyldimethylsilyl)oxy)phenoxy)-3-chloro-5-iodophenyl)propanoate

Methyl (S)-2-((tert-butoxycarbonyl)amino)-3-(4-(4-((tert-butyldimethylsilyl)oxy)phenoxy)-3-chloro-5-iodophenyl)propanoate

  • Catalogue No.:PAI 12 008267

  • CAS :

    NA

  • Molecular Formula : C27H37ClINO6Si

  • Molecular Weight : 662.03

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PAI 12 008268

Methyl (S)-2-((tert-butoxycarbonyl)amino)-3-(3-chloro-4-(4-hydroxyphenoxy)-5-iodophenyl)propanoate

Methyl (S)-2-((tert-butoxycarbonyl)amino)-3-(3-chloro-4-(4-hydroxyphenoxy)-5-iodophenyl)propanoate

  • Catalogue No.:PAI 12 008268

  • CAS :

    NA

  • Molecular Formula : C21H23ClINO6

  • Molecular Weight : 547.77

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PAI 12 008269

(S)-2-((tert-Butoxycarbonyl)amino)-3-(3-chloro-4-(4-hydroxyphenoxy)-5-iodophenyl)propanoic Acid

(S)-2-((tert-Butoxycarbonyl)amino)-3-(3-chloro-4-(4-hydroxyphenoxy)-5-iodophenyl)propanoic Acid

  • Catalogue No.:PAI 12 008269

  • CAS :

    NA

  • Molecular Formula : C20H21ClINO6

  • Molecular Weight : 533.74

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PA 12 0151000

Levothyroxine Glucose Adduct

Levothyroxine Glucose Adduct

  • Catalogue No.:PA 12 0151000

  • CAS :

    NA

  • Molecular Formula : C21H21I4NO9

  • Molecular Weight : 939.01

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PAI 12 008272

2-(4-(4-Hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)acetonitrile

2-(4-(4-Hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)acetonitrile

  • Catalogue No.:PAI 12 008272

  • CAS :

    1425050-46-9

  • Molecular Formula : C14H7I4NO2

  • Molecular Weight : 728.83

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PAI 12 008273

Methyl 4-(4-hydroxyphenoxy)-3,5-diiodobenzoate

Methyl 4-(4-hydroxyphenoxy)-3,5-diiodobenzoate

  • Catalogue No.:PAI 12 008273

  • CAS :

    NA

  • Molecular Formula : C14H10I2O4

  • Molecular Weight : 496.04

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PAI 12 008274

2-Hydroxy-2-(4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)acetonitrile

2-Hydroxy-2-(4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)acetonitrile

  • Catalogue No.:PAI 12 008274

  • CAS :

    NA

  • Molecular Formula : C14H7I4NO3

  • Molecular Weight : 744.83

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PA 12 0151001

Levothyroxine Peak Identification Mixture

Levothyroxine Peak Identification Mixture

  • Catalogue No.:PA 12 0151001

  • CAS :

    NA

  • Molecular Formula : NA

  • Molecular Weight : NA

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PA 12 0151002

Levothyroxine-Lactose Maillard Impurity

Levothyroxine-Lactose Maillard Impurity

  • Catalogue No.:PA 12 0151002

  • CAS :

    NA

  • Molecular Formula : C27H31I4NO14

  • Molecular Weight : 1101.16

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PA 12 0151003

N-Acetyl-3-iodotyrosine

N-Acetyl-3-iodotyrosine

  • Catalogue No.:PA 12 0151003

  • CAS :

    1023-47-8

  • Molecular Formula : C11H12INO4

  • Molecular Weight : 349.12

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PAI 12 008275

((2R,3S,4R,5R,6S)-4,5,6-Trihydroxy-3-(((2S,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)tetrahydro-2H-pyran-2-yl)methyl 4-methylbenzenesulfonate

((2R,3S,4R,5R,6S)-4,5,6-Trihydroxy-3-(((2S,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)tetrahydro-2H-pyran-2-yl)methyl 4-methylbenzenesulfonate

  • Catalogue No.:PAI 12 008275

  • CAS :

    NA

  • Molecular Formula : C19H28O13S

  • Molecular Weight : 496.48

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PAI 12 008276

Methyl (2S)-3-(4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)-2-(((3,4,5-trihydroxy-6-((3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)tetrahydro-2H-pyran-2-yl)methyl)amino)propanoate

Methyl (2S)-3-(4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)-2-(((3,4,5-trihydroxy-6-((3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)tetrahydro-2H-pyran-2-yl)methyl)amino)propanoate

  • Catalogue No.:PAI 12 008276

  • CAS :

    NA

  • Molecular Formula : C28H33I4NO14

  • Molecular Weight : 1115.18

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PA 12 0151004

(2S)-2-(3-(Carboxymethyl)-3-hydroxy-2,5-dioxopyrrolidin-1-yl)-3-(4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)propanoic Acid

(2S)-2-(3-(Carboxymethyl)-3-hydroxy-2,5-dioxopyrrolidin-1-yl)-3-(4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)propanoic Acid

  • Catalogue No.:PA 12 0151004

  • CAS :

    NA

  • Molecular Formula : C21H15I4NO9

  • Molecular Weight : 932.97

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PAI 12 008271

(S)-2-((tert-Butoxycarbonyl)amino)-3-(3-chloro-4-(4-hydroxy-3,5-diiodophenoxy)-5-iodophenyl)propanoic Acid

(S)-2-((tert-Butoxycarbonyl)amino)-3-(3-chloro-4-(4-hydroxy-3,5-diiodophenoxy)-5-iodophenyl)propanoic Acid

  • Catalogue No.:PAI 12 008271

  • CAS :

    NA

  • Molecular Formula : C20H19ClI3NO6

  • Molecular Weight : 785.54

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PAI 12 008270

Methyl (S)-2-((tert-butoxycarbonyl)amino)-3-(3-chloro-4-(4-hydroxy-3,5-diiodophenoxy)-5-iodophenyl)propanoate

Methyl (S)-2-((tert-butoxycarbonyl)amino)-3-(3-chloro-4-(4-hydroxy-3,5-diiodophenoxy)-5-iodophenyl)propanoate

  • Catalogue No.:PAI 12 008270

  • CAS :

    NA

  • Molecular Formula : C21H21ClI3NO6

  • Molecular Weight : 799.56

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PA 12 15800

Thyroxamine

Thyroxamine

  • Catalogue No.:PA 12 15800

  • CAS :

    3571-49-1

  • Molecular Formula : C14H11I4NO2

  • Molecular Weight : 732.86

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PA 12 0151005

Ethyl (S)-2-acetamido-3-(4-(4-methoxyphenoxy)-3,5-dinitrophenyl)propanoate

Ethyl (S)-2-acetamido-3-(4-(4-methoxyphenoxy)-3,5-dinitrophenyl)propanoate

  • Catalogue No.:PA 12 0151005

  • CAS :

    83290-90-8

  • Molecular Formula : C20H21N3O9

  • Molecular Weight : 447.4

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PA 12 0151006

Ethyl (S)-2-acetamido-3-(3,5-diamino-4-(4-methoxyphenoxy)phenyl)propanoate

Ethyl (S)-2-acetamido-3-(3,5-diamino-4-(4-methoxyphenoxy)phenyl)propanoate

  • Catalogue No.:PA 12 0151006

  • CAS :

    440667-78-7

  • Molecular Formula : C20H25N3O5

  • Molecular Weight : 387.44

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PA 12 0151007

Ethyl (S)-2-acetamido-3-(3,5-diiodo-4-(4-methoxyphenoxy)phenyl)propanoate

Ethyl (S)-2-acetamido-3-(3,5-diiodo-4-(4-methoxyphenoxy)phenyl)propanoate

  • Catalogue No.:PA 12 0151007

  • CAS :

    83730-50-1

  • Molecular Formula : C20H21I2NO5

  • Molecular Weight : 609.2

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PA 12 0151008

(S)-2-Acetamido-3-(4-hydroxy-3,5-dinitrophenyl)propanoic Acid

(S)-2-Acetamido-3-(4-hydroxy-3,5-dinitrophenyl)propanoic Acid

  • Catalogue No.:PA 12 0151008

  • CAS :

    20767-00-4

  • Molecular Formula : C11H11N3O8

  • Molecular Weight : 313.22

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PA 12 0151009

Ethyl (S)-2-acetamido-3-(4-hydroxy-3,5-dinitrophenyl)propanoate

Ethyl (S)-2-acetamido-3-(4-hydroxy-3,5-dinitrophenyl)propanoate

  • Catalogue No.:PA 12 0151009

  • CAS :

    29358-99-4

  • Molecular Formula : C13H15N3O8

  • Molecular Weight : 341.28

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PAI 12 008277

4-(4-Methoxyphenoxy)benzaldehyde

4-(4-Methoxyphenoxy)benzaldehyde

  • Catalogue No.:PAI 12 008277

  • CAS :

    78725-47-0

  • Molecular Formula : C14H12O3

  • Molecular Weight : 228.25

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PAI 12 008278

4-(4-Hydroxyphenoxy)benzaldehyde

4-(4-Hydroxyphenoxy)benzaldehyde

  • Catalogue No.:PAI 12 008278

  • CAS :

    91378-31-3

  • Molecular Formula : C13H10O3

  • Molecular Weight : 214.22

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PAI 12 076001

4-(4-Hydroxyphenoxy)-3,5-diiodobenzaldehyde

4-(4-Hydroxyphenoxy)-3,5-diiodobenzaldehyde

  • Catalogue No.:PAI 12 076001

  • CAS :

    2828-49-1

  • Molecular Formula : C13H8I2O3

  • Molecular Weight : 466.01

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PA 12 0151010

(S)-2-Amino-3-(4-(3-(4-(4-((S)-2-amino-2-carboxyethyl)-2,6-diiodophenoxy)-2,6-diiodophenoxy)-4-hydroxy-5-iodophenoxy)-3,5-diiodophenyl)propanoic Acid

(S)-2-Amino-3-(4-(3-(4-(4-((S)-2-amino-2-carboxyethyl)-2,6-diiodophenoxy)-2,6-diiodophenoxy)-4-hydroxy-5-iodophenoxy)-3,5-diiodophenyl)propanoic Acid

  • Catalogue No.:PA 12 0151010

  • CAS :

    2088032-62-4

  • Molecular Formula : C30H21I7N2O8

  • Molecular Weight : 1425.84

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PAI 12 008279

4-Hydroxy-3,5-diiodobenzaldehyde

4-Hydroxy-3,5-diiodobenzaldehyde

  • Catalogue No.:PAI 12 008279

  • CAS :

    1948-40-9

  • Molecular Formula : C7H4I2O2

  • Molecular Weight : 373.92

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PAI 12 008280

4-Hydroxy-3-iodo-5-nitrobenzaldehyde

4-Hydroxy-3-iodo-5-nitrobenzaldehyde

  • Catalogue No.:PAI 12 008280

  • CAS :

    3861-58-3

  • Molecular Formula : C7H4INO4

  • Molecular Weight : 293.02

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PAI 12 008281

Methyl (S)-2-amino-3-(4-(4-hydroxy-3-iodophenoxy)-3,5-diiodophenyl)propanoate

Methyl (S)-2-amino-3-(4-(4-hydroxy-3-iodophenoxy)-3,5-diiodophenyl)propanoate

  • Catalogue No.:PAI 12 008281

  • CAS :

    54914-53-3

  • Molecular Formula : C16H14I3NO4

  • Molecular Weight : 665

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PAI 12 008282

Methyl (S)-2-amino-3-(4-(3-chloro-4-hydroxy-5-iodophenoxy)-3,5-diiodophenyl)propanoate

Methyl (S)-2-amino-3-(4-(3-chloro-4-hydroxy-5-iodophenoxy)-3,5-diiodophenyl)propanoate

  • Catalogue No.:PAI 12 008282

  • CAS :

    NA

  • Molecular Formula : C16H13ClI3NO4

  • Molecular Weight : 699.45

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PA 12 0151011

(S)-3-(4-(4-Hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)-2-stearamidopropanoic Acid

(S)-3-(4-(4-Hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)-2-stearamidopropanoic Acid

  • Catalogue No.:PA 12 0151011

  • CAS :

    NA

  • Molecular Formula : C33H45I4NO5

  • Molecular Weight : 1043.34

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PA 12 0151012

(S)-2-Amino-3-(4-(3,5-diiodo-4-(stearoyloxy)phenoxy)-3,5-diiodophenyl)propanoic Acid

(S)-2-Amino-3-(4-(3,5-diiodo-4-(stearoyloxy)phenoxy)-3,5-diiodophenyl)propanoic Acid

  • Catalogue No.:PA 12 0151012

  • CAS :

    NA

  • Molecular Formula : C33H45I4NO5

  • Molecular Weight : 1043.34

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PAI 12 008283

4-Formyl-2-iodo-6-nitrophenyl 4-methylbenzenesulfonate

4-Formyl-2-iodo-6-nitrophenyl 4-methylbenzenesulfonate

  • Catalogue No.:PAI 12 008283

  • CAS :

    NA

  • Molecular Formula : C14H10INO6S

  • Molecular Weight : 447.20

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PAI 12 008284

3-Iodo-4-(4-methoxyphenoxy)-5-nitrobenzaldehyde

3-Iodo-4-(4-methoxyphenoxy)-5-nitrobenzaldehyde

  • Catalogue No.:PAI 12 008284

  • CAS :

    92060-22-5

  • Molecular Formula : C14H10INO5

  • Molecular Weight : 399.14

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PAI 12 008285

3-Amino-5-iodo-4-(4-methoxyphenoxy)benzaldehyde

3-Amino-5-iodo-4-(4-methoxyphenoxy)benzaldehyde

  • Catalogue No.:PAI 12 008285

  • CAS :

    NA

  • Molecular Formula : C14H12INO3

  • Molecular Weight : 369.16

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PA 12 0151013

(S,E)-2-((3,5-Di-tert-butyl-4-hydroxybenzylidene)amino)-3-(4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)propanoic Acid

(S,E)-2-((3,5-Di-tert-butyl-4-hydroxybenzylidene)amino)-3-(4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)propanoic Acid

  • Catalogue No.:PA 12 0151013

  • CAS :

    NA

  • Molecular Formula : C30H31I4NO5

  • Molecular Weight : 993.2

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PA 12 0151014

(S,E)-2-(Ethylideneamino)-3-(4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)propanoic Acid

(S,E)-2-(Ethylideneamino)-3-(4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)propanoic Acid

  • Catalogue No.:PA 12 0151014

  • CAS :

    NA

  • Molecular Formula : C17H13I4NO4

  • Molecular Weight : 802.91

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