Entecavir Related Compounds & Impurities

Entecavir is a guanosine nucleoside analogue with potent and selective anti-hepatitis B virus activity, used as a first-line treatment for chronic HBV infection.

Simson Pharma Limited along with its subsidiary offices Simson Pharma Global Ltd. (UK) and Simson Pharma Global LLC (USA) is a trusted manufacturer and supplier of high-quality pharmaceutical reference standards, offering a comprehensive portfolio of Entecavir reference standards, pharmacopeial and non-pharmacopeial Entecavir impurities, related compounds, related substances, metabolites, stable isotope-labelled compounds, deuterium labelled compounds and nitrosamine (N-NO) reference standards.

These materials support pharmaceutical research and development, product development, ANDA and DMF submissions, quality control (QC), analytical method development and validation, stability studies, impurity identification, and genotoxic impurity assessment.

Our Entecavir-related reference standards are thoroughly characterized using advanced analytical techniques and are supplied with comprehensive Certificates of Analysis (COA) and supporting analytical data from our USFDA certified, ISO 17025 and ISO 17034 accredited Lab, to meet global regulatory expectations. EP and USP traceable reference standards can also be provided upon request, subject to availability. Simson is also a provider of EP and USP traceable standards. To ensure consistent quality and reliability, our reference standards are periodically re-tested according to established quality management procedures.

Pharmaceutical Reference Standards / Impurity Standards

Entecavir
Entecavir
  • CAT. No.E170000
  • CAS. No.142217-69-4
  • Mol. F.C12H15N5O3
  • Mol. W.277.28 g/mol
  • Stock Status:Under Synthesis
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Entecavir Monohydrate
Entecavir Monohydrate
  • CAT. No.E170000A
  • CAS. No.209216-23-9
  • Mol. F.C12H17N5O4
  • Mol. W.295.29 g/mol
  • Stock Status:Instock
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4-epi-Entecavir
4-epi-Entecavir
  • CAT. No.E170003
  • CAS. No.1367369-80-9
  • Mol. F.C12H15N5O3
  • Mol. W.277.28 g/mol
  • Stock Status:Limited Stock
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Entecavir EP Impurity C
Entecavir EP Impurity C
  • CAT. No.E170004
  • CAS. No.2204369-23-1
  • Mol. F.C12H15N5O4
  • Mol. W.293.28 g/mol
  • Stock Status:Limited Stock
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8-Methoxy Entecavir
8-Methoxy Entecavir
  • CAT. No.E170005
  • CAS. No.2349444-69-3
  • Mol. F.C13H17N5O4
  • Mol. W.307.31 g/mol
  • Stock Status:Instock
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Entecavir EP Impurity F
Entecavir EP Impurity F
  • CAT. No.E170006
  • CAS. No.649761-24-0
  • Mol. F.C27H31N5O2Si
  • Mol. W.485.65 g/mol
  • Stock Status:Limited Stock
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Furoentecavir
Furoentecavir
  • CAT. No.E170008
  • CAS. No.1984788-96-6
  • Mol. F.C12H15N5O4
  • Mol. W.293.28 g/mol
  • Stock Status:Instock
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Entecavir Enantiomer
Entecavir Enantiomer
  • CAT. No.E170009
  • CAS. No.188399-46-4
  • Mol. F.C12H15N5O3
  • Mol. W.277.28 g/mol
  • Stock Status:Limited Stock
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(1R,3R,4R)-Entecavir
(1R,3R,4R)-Entecavir
  • CAT. No.E170011
  • CAS. No.1367369-76-3
  • Mol. F.C12H15N5O3
  • Mol. W.277.28 g/mol
  • Stock Status:Custom Synthesis
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Entecavir EP Impurity A
Entecavir EP Impurity A
  • CAT. No.E170012
  • CAS. No.1367369-78-5
  • Mol. F.C12H15N5O3
  • Mol. W.277.28 g/mol
  • Stock Status:Limited Stock
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Furoentecavir
Furoentecavir
  • CAT. No.E170013
  • CAS. No.NA
  • Mol. F.C12H15N5O4
  • Mol. W.293.28 g/mol
  • Stock Status:Custom Synthesis
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Entecavir EP Impurity B
Entecavir EP Impurity B
  • CAT. No.E170014
  • CAS. No.1367369-77-4
  • Mol. F.C12H15N5O3
  • Mol. W.277.28 g/mol
  • Stock Status:Custom Synthesis
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Entecavir-3-Epimer Hydrochloride
Entecavir-3-Epimer Hydrochloride
  • CAT. No.E170014A
  • CAS. No.NA
  • Mol. F.C12H15N5O3.HCl
  • Mol. W.313.74 g/mol
  • Stock Status:Custom Synthesis
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3`,5`-di-O-Benzyl Entecavir
3`,5`-di-O-Benzyl Entecavir
  • CAT. No.E170017
  • CAS. No.142217-81-0
  • Mol. F.C26H27N5O3
  • Mol. W.457.52 g/mol
  • Stock Status:Instock
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Entecavir EP Impurity F
Entecavir EP Impurity F
  • CAT. No.E170018
  • CAS. No.649761-24-0
  • Mol. F.C27H31N5O2Si
  • Mol. W.485.65 g/mol
  • Stock Status:Custom Synthesis
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4-Dimethylsilyl Entecavir
4-Dimethylsilyl Entecavir
  • CAT. No.E170019
  • CAS. No.870614-82-7
  • Mol. F.C14H21N5O3Si
  • Mol. W.335.43 g/mol
  • Stock Status:Limited Stock
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Entecavir Impurity 18
Entecavir Impurity 18
  • CAT. No.E170020
  • CAS. No.142217-77-4
  • Mol. F.C32H33N5O4
  • Mol. W.551.60 g/mol
  • Stock Status:Custom Synthesis
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2-Amino-9-((1S,3S,4S)-4-(benzyloxy)-3-((benzyloxy)methyl)-2-methylenecyclopentyl)-1H-purin-6(9H)-one
2-Amino-9-((1S,3S,4S)-4-(benzyloxy)-3-((benzyloxy)methyl)-2-methylenecyclopentyl)-1H-purin-6(9H)-one
  • CAT. No.E170022
  • CAS. No.NA
  • Mol. F.C26H27N5O3
  • Mol. W.457.52 g/mol
  • Stock Status:Custom Synthesis
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ent-Entecavir-di-o-benzyl Ether
ent-Entecavir-di-o-benzyl Ether
  • CAT. No.E170023
  • CAS. No.1354695-82-1
  • Mol. F.C26H27N5O3
  • Mol. W.457.53 g/mol
  • Stock Status:Custom Synthesis
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Entecavir Impurity 23
Entecavir Impurity 23
  • CAT. No.E170024
  • CAS. No.1354695-86-5
  • Mol. F.C26H27N5O3
  • Mol. W.457.52 g/mol
  • Stock Status:Custom Synthesis
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Entecavir Impurity 19
Entecavir Impurity 19
  • CAT. No.E170025
  • CAS. No.1354695-84-3
  • Mol. F.C26H27N5O3
  • Mol. W.457.53 g/mol
  • Stock Status:Custom Synthesis
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2-Amino-1,9-dihydro-9-[(1S.3R,4R)-4-(benzyloxy)-3-((benzyloxy)methyl)-2-methylenecyclopentyl]-6H-purin-6-one
2-Amino-1,9-dihydro-9-[(1S.3R,4R)-4-(benzyloxy)-3-((benzyloxy)methyl)-2-methylenecyclopentyl]-6H-purin-6-one
  • CAT. No.E170026
  • CAS. No.1354695-85-4
  • Mol. F.C26H27N5O3
  • Mol. W.457.52 g/mol
  • Stock Status:Custom Synthesis
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Entecavir 3-Epimer Hydrochloride
Entecavir 3-Epimer Hydrochloride
  • CAT. No.E170027
  • CAS. No.NA
  • Mol. F.C12H15N5O3.HCl
  • Mol. W.313.74 g/mol
  • Stock Status:Custom Synthesis
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Entecvir lactose Adduct Impurity-1
Entecvir lactose Adduct Impurity-1
  • CAT. No.E170028
  • CAS. No.NA
  • Mol. F.C24H35N5O13
  • Mol. W.601.56 g/mol
  • Stock Status:Custom Synthesis
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Entecvir lactose Adduct Impurity-2
Entecvir lactose Adduct Impurity-2
  • CAT. No.E170029
  • CAS. No.NA
  • Mol. F.C24H35N5O13
  • Mol. W.601.56 g/mol
  • Stock Status:Custom Synthesis
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Entecavir Impurity 24
Entecavir Impurity 24
  • CAT. No.E170030
  • CAS. No.110567-22-1
  • Mol. F.C20H22O3
  • Mol. W.310.40 g/mol
  • Stock Status:Custom Synthesis
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O-6-Benzyl Guanine
O-6-Benzyl Guanine
  • CAT. No.E170031
  • CAS. No.19916-73-5
  • Mol. F.C12H11N5O
  • Mol. W.241.30 g/mol
  • Stock Status:Custom Synthesis
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Entecavir Impurity 25
Entecavir Impurity 25
  • CAT. No.E170032
  • CAS. No.117641-39-1
  • Mol. F.C13H16O3
  • Mol. W.220.30 g/mol
  • Stock Status:Custom Synthesis
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(1R,3S,4S)-Entecavir
(1R,3S,4S)-Entecavir
  • CAT. No.E170033
  • CAS. No.1367369-81-0
  • Mol. F.C12H15N5O3
  • Mol. W.277.28 g/mol
  • Stock Status:Custom Synthesis
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Entecavir Impurity 26
Entecavir Impurity 26
  • CAT. No.E170034
  • CAS. No.NA
  • Mol. F.C12H17N5O3
  • Mol. W.279.30 g/mol
  • Stock Status:Custom Synthesis
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Entecavir Impurity 27
Entecavir Impurity 27
  • CAT. No.E170035
  • CAS. No.NA
  • Mol. F.C12H15N5O3
  • Mol. W.277.28 g/mol
  • Stock Status:Custom Synthesis
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Entecavir epimer 2
Entecavir epimer 2
  • CAT. No.E170036
  • CAS. No.NA
  • Mol. F.C12H15N5O3
  • Mol. W.277.28 g/mol
  • Stock Status:Custom Synthesis
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Entecavir impurity 5
Entecavir impurity 5
  • CAT. No.E170037
  • CAS. No.142217-78-5
  • Mol. F.C52H49N5O5
  • Mol. W.823.98 g/mol
  • Stock Status:Custom Synthesis
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Entecavir impurity 6
Entecavir impurity 6
  • CAT. No.E170038
  • CAS. No.142217-80-9
  • Mol. F.C53H49N5O4
  • Mol. W.819.99 g/mol
  • Stock Status:Custom Synthesis
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Isotope Labelled Compounds

Entecavir-D2
Entecavir-D2
  • CAT. No.E170002
  • CAS. No.NA
  • Mol. F.C12H13N5O3D2
  • Mol. W.279.34 g/mol
  • Stock Status:Custom Synthesis
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Entecavir-13C2,15N
Entecavir-13C2,15N
  • CAT. No.E170015
  • CAS. No.1329796-53-3
  • Mol. F.C1013C2H15N415NO3
  • Mol. W.280.26 g/mol
  • Stock Status:Custom Synthesis
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Entecavir-13C3-15N
Entecavir-13C3-15N
  • CAT. No.E170016
  • CAS. No.NA
  • Mol. F.C913C3H16N415NClO3
  • Mol. W.317.71 g/mol
  • Stock Status:Limited Stock
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