Database / Pharmaceutical impurity
Pharmaceutical impurityEntecavir Impurity 35
Entecavir Impurity 35 is listed in the pharmaceutical impurity collection under CAS 701278-07-1. Its represented structure has formula C20H25N5O2Si and a calculated molecular weight of 395.54 g/mol.
2D chemical structure
Chemical identity
- Catalog name
- Entecavir Impurity 35
- Common name
- Entecavir Impurity 35
- Chemical name
- 2-amino-9-[(1S,3R,4S)-4-[dimethyl(phenyl)silyl]-3-(hydroxymethyl)-2-methylidenecyclopentyl]-1H-purin-6-one
- CAS
- 701278-07-1
- SMILES
- C=C1[C@H](CO)[C@@H]([Si](C)(C)c2ccccc2)C[C@@H]1n1cnc2c(=O)[nH]c(N)nc21
- InChI
- InChI=1S/C20H25N5O2Si/c1-12-14(10-26)16(28(2,3)13-7-5-4-6-8-13)9-15(12)25-11-22-17-18(25)23-20(21)24-19(17)27/h4-8,11,14-16,26H,1,9-10H2,2-3H3,(H3,21,23,24,27)/t14-,15-,16-/m0/s1
- InChIKey
- UFYJQSNORIUZKS-JYJNAYRXSA-N
- Associated API
- Entecavir
Record ID: A15dded9e15eb
Computed properties
C20H25N5O2Si Molecular formula
395.539 g/molMolecular weight
395.1778 DaMonoisotopic exact mass
109.82 ŲTopological polar surface area
1.7971 Calculated LogP (Wildman–Crippen)
113.2389 cm³/molMolar refractivity (Wildman–Crippen)
5 countHydrogen-bond acceptors
3 countHydrogen-bond donors
Descriptors are calculated from the displayed SMILES. Calculated LogP is not a measured partition coefficient or a pH-specific LogD.
Molecular descriptor profile
Structural feature counts
Element composition
Radar scale: 0–100 percentile within 25,771 distinct represented structures in this release, using the midpoint rank for ties. Larger values indicate a higher descriptor rank, not greater safety or toxicity. Element counts include hydrogen and combine isotopes under each element.
Radar values and percentile reference
| Descriptor | Value | Percentile |
|---|---|---|
| Molecular weight | 395.539 | 68.59 |
| Calculated LogP (Wildman–Crippen) | 1.7971 | 38.73 |
| Topological polar surface area | 109.82 | 77.30 |
| Hydrogen-bond acceptors | 5 | 65.12 |
| Hydrogen-bond donors | 3 | 81.39 |
| Rotatable bonds (strict) | 4 | 49.39 |
Complete molecular descriptors
| Property | Calculated value | Unit / type |
|---|---|---|
| Molecular formula | C20H25N5O2Si | dimensionless |
| Molecular weight | 395.539 | g/mol |
| Monoisotopic exact mass | 395.1778 | Da |
| Topological polar surface area | 109.82 | Ų |
| Calculated LogP (Wildman–Crippen) | 1.7971 | dimensionless |
| Molar refractivity (Wildman–Crippen) | 113.2389 | cm³/mol |
| Hydrogen-bond acceptors | 5 | count |
| Hydrogen-bond donors | 3 | count |
| Rotatable bonds (strict) | 4 | count |
| Heavy atoms | 28 | count |
| Heteroatoms | 8 | count |
| Rings | 4 | count |
| Aromatic rings | 3 | count |
| Aliphatic rings | 1 | count |
| Saturated rings | 1 | count |
| Aromatic heterocycles | 2 | count |
| Aliphatic heterocycles | 0 | count |
| Saturated heterocycles | 0 | count |
| Aromatic carbocycles | 1 | count |
| Aliphatic carbocycles | 1 | count |
| Fraction of sp³ carbon atoms | 0.35 | fraction |
| Formal charge | 0 | e |
| Disconnected components | 1 | count |
| Isotopically specified atoms | 0 | count |
| Potential atom stereocenters | 3 | count |
| Unspecified atom stereocenters | 0 | count |
| Spiro atoms | 0 | count |
| Bridgehead atoms | 0 | count |
| Labute approximate surface area | 163.5139 | Ų |
| Valence electrons | 146 | count |
| Radical electrons | 0 | count |
| Bertz complexity | 1,088.9192 | index |
| Balaban J | 1.7737 | index |
Ring categories overlap and should not be summed. No toxicity result, PDE, HBEL or acceptable intake is inferred from these descriptors.
Toxicological services and resources for Entecavir Impurity 35
Qualification and safety assessment of Entecavir Impurity 35
Explore toxicological qualification of Entecavir Impurity 35 and ICH M7 mutagenic impurity assessment of Entecavir Impurity 35 for evaluation of this impurity in its pharmaceutical context.
Where data gaps need to be addressed, resources include read-across assessment for Entecavir Impurity 35 and acceptable intake and limit justification for Entecavir Impurity 35. The relevant approach depends on the available evidence, exposure and duration of use.
Related Altox services and technical resources
- ICH M7 Mutagenic Impurity Assessment
- Genotoxic Impurity Risk Assessment
- (Q)SAR Mutagenicity Assessment
- Mutagenic and Non-Mutagenic Impurity Assessment
- Toxicological Qualification of Impurities and Degradation Products
- Toxicological Read-Across Assessment
- Impurity Specification Setting and Limit Justification
- Acceptable Intake (AI) Assessment and Limit Derivation
Identity sources and calculation method
Identifiers originate from the source catalogues and available public identity records. InChI and InChIKey on this page are generated from the displayed SMILES. RDKit validation checks the molecular representation; it does not independently verify every catalogue assignment.
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