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.
Levothyroxine
Catalogue No.:PA 12 15000
CAS :
Molecular Formula : C15H11I4NO4
Molecular Weight : 776.87
Liothyronine
Catalogue No.:PA 12 15010
Molecular Formula : C15H12I3NO4
Molecular Weight : 650.97
Triiodothyroacetic Acid
Catalogue No.:PA 12 15030
Molecular Formula : C14H9I3O4
Molecular Weight : 621.93
Tetraiodothyroacetic Acid
Catalogue No.:PA 12 15040
Molecular Formula : C14H8I4O4
Molecular Weight : 747.83
Diiodothyronine
Catalogue No.:PA 12 15050
Molecular Formula : C15H13I2NO4
Molecular Weight : 525.08
Levothyroxine Benzoic Acid Impurity
Catalogue No.:PA 12 15080
Molecular Formula : C13H6I4O4
Molecular Weight : 733.80
Levothyroxine Benzaldehyde Impurity
Catalogue No.:PA 12 15090
Molecular Formula : C13H6I4O3
Molecular Weight : 717.80
Levothyroxine N-Methylamide
Catalogue No.:PA 12 15540
Molecular Formula : C16H14I4N2O3
Molecular Weight : 789.91
β-Hydroxy Thyroxine
Catalogue No.:PA 12 15580
Molecular Formula : C15H11I4NO5
Molecular Weight : 792.87
Monochlorotriiodothyronine
Catalogue No.:PA 12 15590
Molecular Formula : C15H11ClI3NO4
Molecular Weight : 685.42
N-Formyl Thyroxine
Catalogue No.:PA 12 15670
Molecular Formula : C16H11I4NO5
Molecular Weight : 804.88
N-Acetyl L-Thyroxine
Catalogue No.:PA 12 15680
Molecular Formula : C17H13I4NO5
Molecular Weight : 818.91
Levothyroxine Acetamide Impurity
Catalogue No.:PA 12 15690
Molecular Formula : C14H9I4NO3
Molecular Weight : 746.84
2-(4-(4-Hydroxyphenoxy)-3,5-diiodophenyl)acetic Acid
Catalogue No.:PA 12 15740
Molecular Formula : C14H10I2O4
Molecular Weight : 496.04
Di(p-Anisyl)iodonium Bromide
Catalogue No.:PA 12 15820
Molecular Formula : C14H14BrIO2
Molecular Weight : 421.07
Levothyroxine-Lactose Maillard Impurity
Catalogue No.:PA 12 0151002
Molecular Formula : C27H31I4NO14
Molecular Weight : 1101.16
3-Chloro Thyroxine
Catalogue No.:PA 12 15020
(2S)-2-Amino-3-[4-[4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenoxy]-3,5-diiodophenyl]propanoic Acid
Catalogue No.:PA 12 15060
Molecular Formula : C21H13I6NO5
Molecular Weight : 1120.76
3,3'-Diiodo-L-Thyronine
Catalogue No.:PA 12 15100
3,3',5'-Triiodo-L-Thyronine
Catalogue No.:PA 12 15110
Levothyroxine Sodium
Catalogue No.:PA 12 15510
Molecular Formula : C15H10I4NNaO4
Molecular Weight : 798.85
Levothyroxine Ethyl Ester
Catalogue No.:PA 12 15520
Molecular Formula : C17H15I4NO4
Molecular Weight : 804.92
Levothyroxine Methyl Ester
Catalogue No.:PA 12 15530
Molecular Formula : C16H13I4NO4
Molecular Weight : 790.9
O-(4-Hydroxy-3,5-diiodophenyl)-3,5-diiodo-hydroxy-L-tyrosine
Catalogue No.:PA 12 15550
O-Methyl Tetraiodothyroethylamine
Catalogue No.:PA 12 15560
Molecular Formula : C15H13I4NO2
Molecular Weight : 746.89
2-Acetamido-3-(4-acetoxy-3,5-diiodophenyl)propanoic Acid
Catalogue No.:PA 12 15570
Molecular Formula : C13H13I2NO5
Molecular Weight : 517.05
DL-Thyroxine
Catalogue No.:PA 12 15600
(S)-2-Amino-3-(4-(4-(4-hydroxy-3-iodophenoxy)-3,5-diiodophenoxy)-3,5-diiodophenyl)propanoic Acid
Catalogue No.:PA 12 15610
Molecular Formula : C21H14I5NO5
Molecular Weight : 994.86
2-Hydroxy-2-(4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)-N-methylacetamide
Catalogue No.:PA 12 15620
(S)-2-Amino-3-(4-(4-(4-hydroxy-3,5-diiodophenoxy)-3-iodophenoxy)-3,5-diiodophenyl)propanoic Acid
Catalogue No.:PA 12 15630
4-(4-Hydroxy-3,5-diiodophenoxy)-3,5-diiodo-N-methylbenzamide
Catalogue No.:PA 12 15640
3,4-Bis(4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)-1H-pyrrole-2-carboxylic acid
Catalogue No.:PA 12 15650
Molecular Formula : C29H13I8NO6
Molecular Weight : 1486.65
Levothyroxine Lactose Adduct
Catalogue No.:PA 12 15660
Molecular Weight : 1101.15
3,5,3',5'-Tetraiodo Thyromandelic Acid
Catalogue No.:PA 12 15700
Molecular Formula : C14H8I4O5
Molecular Weight : 763.83
Levothyroxine D-Isomer
Catalogue No.:PA 12 15710
3-[4-(4-Hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl]lactic Acid
Catalogue No.:PA 12 15720
Molecular Formula : C15H10I4O5
Molecular Weight : 777.85
2-Amino-3-(4-(4-hydroxyphenoxy)-3,5-diiodophenyl)propanoic Acid
Catalogue No.:PA 12 15730
(S)-2-Amino-3-(3,5-diiodo-4-(4-methoxyphenoxy)phenyl Propanoic Acid
Catalogue No.:PA 12 15750
Molecular Formula : C16H15I2NO4
Molecular Weight : 539.1
(S)-2-Amino-3-(4-(3,5-diiodo-4-methoxyphenoxy)-3,5-diiodophenyl)propanoic Acid
Catalogue No.:PA 12 15760
Levothyroxine-13C9-15N
Catalogue No.:PA STI 056521
Molecular Formula : C613C9H11I415NO4
Molecular Weight : 786.77
Levothyroxine-d3
Catalogue No.:PA STI 056522
Molecular Formula : C15H7D4I4NO4
Molecular Weight : 780.89
4-(4-Hydroxy-3,5-diiodophenoxy)-3,5-diiodo-benzenemethanol
Catalogue No.:PA 12 15770
Molecular Formula : C13H8I4O3
Molecular Weight : 719.82
4-(4-Ethyl-2,6-diiodophenoxy)-2,6-diiodo-phenol
Catalogue No.:PA 12 15780
Molecular Formula : C14H10I4O2
Molecular Weight : 717.85
α-Amino-4-hydroxy-3,5-diiodo-benzeneacetic Acid
Catalogue No.:PA 12 15790
Molecular Formula : C8H7I2NO3
Molecular Weight : 418.96
Catalogue No.:PA ICRS0336
Molecular Formula :
Molecular Weight : NA
Levothyroxine sodium (L0570000)
Catalogue No.:PA EPL0570000
Molecular Formula : NA
Levothyroxine for peak identification (Y0001382)
Catalogue No.:PA EPY0001382
Levothyroxine (1365000)
Catalogue No.:PA USP1365000
Levothyroxine for Peak Identification (levothyroxine sodium spiked with liothyronine, triiodothyroa (1365021)
Catalogue No.:PA USP1365021
Levothyroxine Sodium (1365065)
Catalogue No.:PA USP1365065
Catalogue No.:PAI 12 008010
Molecular Formula : C10H12ClNO3
Molecular Weight : 229.66
Catalogue No.:PAI 12 008020
Molecular Formula : C15H20ClNO5
Molecular Weight : 329.78
Catalogue No.:PAI 12 008030
Molecular Formula : C15H19ClINO5
Molecular Weight : 455.67
Catalogue No.:PAI 12 008040
Molecular Formula : C21H23ClINO6
Molecular Weight : 547.77
Catalogue No.:PAI 12 008050
Molecular Formula : C22H24ClI2NO6
Molecular Weight : 687.69
N-Acetyl L-Thyroxine Ethyl Ester
Catalogue No.:PA 12 15810
Molecular Formula : C19H17I4NO5
Molecular Weight : 846.96
2,6-Diiodophenol
Catalogue No.:PA 12 15830
Molecular Formula : C6H4I2O
Molecular Weight : 345.91
2,6-Diiodobenzene-1,4-diol
Catalogue No.:PA 12 15840
Molecular Formula : C6H4I2O2
Molecular Weight : 361.9
(S)-3-(4-(4-Hydroxy-3-iodophenoxy)-3,5-diiodophenyl)-2-nitrosopropanoic Acid
Catalogue No.:PA 12 15850
Molecular Formula : C15H10I3NO5
Molecular Weight : 664.96
Levothyroxine-13C9-15N Hydrochloride
Catalogue No.:PA STI 056523
Molecular Formula : C613C9H12ClI415NO4
Molecular Weight : 822.75
N-(Trifluoroacetyl)-L-thyroxine Methyl Ester
Catalogue No.:PA 12 15860
Molecular Formula : C18H12F3I4NO5
Molecular Weight : 886.9
2,3,4-Trifluoro-α-[[[(1S)-2-hydroxy-1-methylethyl]amino]methylene]-β-oxo-benzenepropanoic Acid Ethyl Ester
Catalogue No.:PA 12 15870
Molecular Formula : C15H16F3NO4
Molecular Weight : 331.29
3,3’,5-Triiodo Thyroacetic Acid n-Butyl Ester
Catalogue No.:PA 12 15880
Molecular Formula : C18H17I3O4
Molecular Weight : 678.04
3,3’,5-Triiodo-D-thyronine
Catalogue No.:PA 12 15890
3,3’,5-Triiodo-L-thyronine 4’-O-Sulfate
Catalogue No.:PA 12 15900
Molecular Formula : C15H12I3NO7S
Molecular Weight : 731.04
Methyl (S)-2-amino-3-(4-(4-hydroxyphenoxy)-3,5-diiodophenyl)propanoate
Catalogue No.:PAI 12 008060
Molecular Weight : 539.11
Methyl (S)-2-((tert-butoxycarbonyl)amino)-3-(4-(4-hydroxyphenoxy)-3,5-diiodophenyl)propanoate
Catalogue No.:PAI 12 008070
Molecular Formula : C21H23I2NO6
Molecular Weight : 639.22
Methyl (S)-2-((tert-butoxycarbonyl)amino)-3-(4-(4-hydroxy-3-iodophenoxy)-3,5-diiodophenyl)propanoate
Catalogue No.:PAI 12 008080
Molecular Formula : C21H22I3NO6
Molecular Weight : 765.12
(S)-2-((tert-Butoxycarbonyl)amino)-3-(4-(4-hydroxy-3-iodophenoxy)-3,5-diiodophenyl)propanoic Acid
Catalogue No.:PAI 12 008090
Molecular Formula : C20H20I3NO6
Molecular Weight : 751.09
Methyl (S)-2-((tert-butoxycarbonyl)amino)-3-(4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)propanoate
Catalogue No.:PAI 12 008100
Molecular Formula : C21H21I4NO6
Molecular Weight : 891.02
Methyl (S)-2-((tert-butoxycarbonyl)amino)-3-(4-(4-(4-((tert-butyldimethylsilyl)oxy)phenoxy)-3,5-diiodophenoxy)-3,5-diiodophenyl)propanoate
Catalogue No.:PAI 12 008110
Molecular Formula : C33H39I4NO7Si
Molecular Weight : 1097.38
Methyl (S)-2-((tert-butoxycarbonyl)amino)-3-(4-(4-(4-hydroxyphenoxy)-3,5-diiodophenoxy)-3,5-diiodophenyl)propanoate
Catalogue No.:PAI 12 008120
Molecular Formula : C27H25I4NO7
Molecular Weight : 983.11
Ethyl (S)-2-((tert-butoxycarbonyl)amino)-3-(4-(4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenoxy)-3,5-diiodophenyl)propanoate
Catalogue No.:PAI 12 008130
Molecular Formula : C27H23I6NO7
Molecular Weight : 1234.91
(S)-2-((tert-Butoxycarbonyl)amino)-3-(4-(4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenoxy)-3,5-diiodophenyl)propanoic Acid
Catalogue No.:PAI 12 008140
Molecular Formula : C26H21I6NO7
Molecular Weight : 1220.88
(2R,3R,4S,5R,6R)-6-(Acetoxymethyl)-5-(((2S,3R,4S,5S,6R)-3,4,5-triacetoxy-6-(acetoxymethyl)tetrahydro-2H-pyran-2-yl)oxy)tetrahydro-2H-pyran-2,3,4-triyl Triacetate
Catalogue No.:PAI 12 008150
Molecular Formula : C28H38O19
Molecular Weight : 678.59
(2R,3S,4S,5R,6S)-2-(Acetoxymethyl)-6-(((2R,3R,4S,5R,6S)-4,5-diacetoxy-2-(acetoxymethyl)-6-(((S)-3-(4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)-1-methoxy-1-oxopropan-2-yl)amino)tetrahydro-2H-pyran-3-yl)oxy)tetrahydro-2H-pyran-3,4,5-triyl Triacetate
Catalogue No.:PAI 12 008160
Molecular Formula : C42H47I4NO2
Molecular Weight : 1409.44
(S)-2-(((2S,3R,4S,5R,6R)-3,4-Diacetoxy-6-(acetoxymethyl)-5-(((2S,3R,4S,5S,6R)-3,4,5-triacetoxy-6-(acetoxymethyl)tetrahydro-2H-pyran-2-yl)oxy)tetrahydro-2H-pyran-2-yl)amino)-3-(4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)propanoic Acid
Catalogue No.:PAI 12 008170
Molecular Formula : C41H45I4NO21
Molecular Weight : 1395.41
Methyl (S)-2-(((2S,3R,4R,5S,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-(((2S,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)tetrahydro-2H-pyran-2-yl)amino)-3-(4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl)propanoate
Catalogue No.:PAI 12 008180
Molecular Formula : C28H33I4NO14
Molecular Weight : 1115.18
Methyl L-tyrosinate,
Catalogue No.:PAI 12 008190
Molecular Formula : C10H13NO3
Molecular Weight : 195.22
Methyl (S)-2-amino-3-(3-chloro-4-hydroxyphenyl)propanoate,
Catalogue No.:PAI 12 008200
Methyl (S)-2-amino-3-(3-chloro-4-hydroxy-5-iodophenyl)propanoate,
Catalogue No.:PAI 12 008210
Molecular Formula : C10H11ClINO3
Molecular Weight : 355.56
Methyl (S)-2-((tert-butoxycarbonyl)amino)-3-(3-chloro-4-hydroxy-5-iodophenyl)propanoate,
Catalogue No.:PAI 12 008220
Methyl (S)-2-((tert-butoxycarbonyl)amino)-3-(3-chloro-5-iodo-4-(4-methoxyphenoxy)phenyl)propanoate,
Catalogue No.:PAI 12 008230
Molecular Formula : C22H25ClINO6
Molecular Weight : 561.81
(S)-2-amino-3-(3-chloro-4-(4-hydroxyphenoxy)-5-iodophenyl)propanoic acid,
Catalogue No.:PAI 12 008240
Molecular Formula : C15H13ClINO4
Molecular Weight : 433.63
tert-Butyl 4-hydroxy-3,5-diiodobenzoate
Catalogue No.:PAI 12 008241
Molecular Formula : C11H12I2O3
Molecular Weight : 446.02
tert-Butyl 4-(4-((tert-butyldimethylsilyl)oxy)phenoxy)-3,5-diiodobenzoate
Catalogue No.:PAI 12 008242
Molecular Formula : C23H30I2O4Si
Molecular Weight : 652.38
tert-Butyl 4-(4-((tert-butyldimethylsilyl)oxy)-3,5-diiodophenoxy)-3,5-diiodobenzoate
Catalogue No.:PAI 12 008243
Molecular Formula : C23H28I4O4Si
Molecular Weight : 904.18
4-(4-((tert-Butyldimethylsilyl)oxy)-3,5-diiodophenoxy)-3,5-diiodobenzoic Acid
Catalogue No.:PAI 12 008244
Molecular Formula : C19H20I4O4Si
Molecular Weight : 848.07
(4-(4-((tert-Butyldimethylsilyl)oxy)-3,5-diiodophenoxy)-3,5-diiodophenyl)methanol
Catalogue No.:PAI 12 008245
Molecular Formula : C19H22I4O3Si
Molecular Weight : 834.08
4-(4-((tert-Butyldimethylsilyl)oxy)-3,5-diiodophenoxy)-3,5-diiodobenzyl 4-methylbenzenesulfonate
Catalogue No.:PAI 12 008246
Molecular Formula : C26H28I4O5SSi
Molecular Weight : 988.27
2-(4-(4-((tert-Butyldimethylsilyl)oxy)-3,5-diiodophenoxy)-3,5-diiodophenyl)acetonitrile
Catalogue No.:PAI 12 008247
Molecular Formula : C20H21I4NO2Si
Molecular Weight : 843.1
Methyl 4-(4-((tert-butyldimethylsilyl)oxy)phenoxy)-3,5-diiodobenzoate
Catalogue No.:PAI 12 008248
Molecular Formula : C20H24I2O4Si
Molecular Weight : 610.3
Methyl 4-(4-((tert-butyldimethylsilyl)oxy)-3,5-diiodophenoxy)-3,5-diiodobenzoate
Catalogue No.:PAI 12 008249
Molecular Formula : C20H22I4O4Si
Molecular Weight : 862.09
Methyl 4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodobenzoate
Catalogue No.:PAI 12 008250
Methyl 4-hydroxy-3,5-dinitrobenzoate
Catalogue No.:PAI 12 008251
Molecular Formula : C8H6N2O7
Molecular Weight : 242.14
Methyl 4-chloro-3,5-dinitrobenzoate
Catalogue No.:PAI 12 008252
Molecular Formula : C8H5ClN2O6
Molecular Weight : 260.59
Methyl 4-(4-methoxyphenoxy)-3,5-dinitrobenzoate
Catalogue No.:PAI 12 008253
Molecular Formula : C15H12N2O8
Molecular Weight : 348.27
Methyl 3,5-diamino-4-(4-methoxyphenoxy)benzoate
Catalogue No.:PAI 12 008254
Molecular Formula : C15H16N2O4
Molecular Weight : 288.3
3,5-Diiodo-4(4'-methoxyphenoxy)benzoic Acid Methyl Ester
Catalogue No.:PAI 12 008255
Molecular Formula : C15H12I2O4
Molecular Weight : 510.07
3,5-Diiodo-4-(4-methoxyphenoxy)benzoic Acid
Catalogue No.:PAI 12 008256
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