Database / Pharmaceutical impurity
Pharmaceutical impurityEntecavir Impurity 3
Entecavir Impurity 3 is listed in the pharmaceutical impurity collection under CAS 84868-56-4. Its represented structure has formula C21H20O2 and a calculated molecular weight of 304.39 g/mol.
2D chemical structure
Chemical identity
- Catalog name
- Entecavir Impurity 3
- Common name
- Entecavir Impurity 3
- Chemical name
- 1-methoxy-4-[methoxy(diphenyl)methyl]benzene
- CAS
- 84868-56-4
- SMILES
- COc1ccc(C(OC)(c2ccccc2)c2ccccc2)cc1
- InChI
- InChI=1S/C21H20O2/c1-22-20-15-13-19(14-16-20)21(23-2,17-9-5-3-6-10-17)18-11-7-4-8-12-18/h3-16H,1-2H3
- InChIKey
- OIPYPMBVSRLTGA-UHFFFAOYSA-N
- Associated API
- Entecavir
Record ID: A436e0007aadc
Computed properties
C21H20O2 Molecular formula
304.389 g/molMolecular weight
304.1463 DaMonoisotopic exact mass
18.46 ŲTopological polar surface area
4.6335 Calculated LogP (Wildman–Crippen)
92.769 cm³/molMolar refractivity (Wildman–Crippen)
2 countHydrogen-bond acceptors
0 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 | 304.389 | 45.58 |
| Calculated LogP (Wildman–Crippen) | 4.6335 | 86.19 |
| Topological polar surface area | 18.46 | 5.77 |
| Hydrogen-bond acceptors | 2 | 15.92 |
| Hydrogen-bond donors | 0 | 11.28 |
| Rotatable bonds (strict) | 5 | 60.59 |
Complete molecular descriptors
| Property | Calculated value | Unit / type |
|---|---|---|
| Molecular formula | C21H20O2 | dimensionless |
| Molecular weight | 304.389 | g/mol |
| Monoisotopic exact mass | 304.1463 | Da |
| Topological polar surface area | 18.46 | Ų |
| Calculated LogP (Wildman–Crippen) | 4.6335 | dimensionless |
| Molar refractivity (Wildman–Crippen) | 92.769 | cm³/mol |
| Hydrogen-bond acceptors | 2 | count |
| Hydrogen-bond donors | 0 | count |
| Rotatable bonds (strict) | 5 | count |
| Heavy atoms | 23 | count |
| Heteroatoms | 2 | count |
| Rings | 3 | count |
| Aromatic rings | 3 | count |
| Aliphatic rings | 0 | count |
| Saturated rings | 0 | count |
| Aromatic heterocycles | 0 | count |
| Aliphatic heterocycles | 0 | count |
| Saturated heterocycles | 0 | count |
| Aromatic carbocycles | 3 | count |
| Aliphatic carbocycles | 0 | count |
| Fraction of sp³ carbon atoms | 0.1429 | fraction |
| Formal charge | 0 | e |
| Disconnected components | 1 | count |
| Isotopically specified atoms | 0 | count |
| Potential atom stereocenters | 0 | count |
| Unspecified atom stereocenters | 0 | count |
| Spiro atoms | 0 | count |
| Bridgehead atoms | 0 | count |
| Labute approximate surface area | 136.8675 | Ų |
| Valence electrons | 116 | count |
| Radical electrons | 0 | count |
| Bertz complexity | 694.3149 | index |
| Balaban J | 2.238 | 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 3
Qualification and safety assessment of Entecavir Impurity 3
Explore toxicological qualification of Entecavir Impurity 3 and ICH M7 mutagenic impurity assessment of Entecavir Impurity 3 for evaluation of this impurity in its pharmaceutical context.
Where data gaps need to be addressed, resources include read-across assessment for Entecavir Impurity 3 and acceptable intake and limit justification for Entecavir Impurity 3. 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.
Discuss an assessment for Entecavir Impurity 3
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