Database / Pharmaceutical impurity
Pharmaceutical impurityFebuxostat Impurity 106
Febuxostat Impurity 106 is listed in the pharmaceutical impurity collection under CAS 1346238-15-0. Its represented structure has formula C18H22N2O4S and a calculated molecular weight of 362.45 g/mol.
2D chemical structure
Chemical identity
- Catalog name
- Febuxostat Impurity 106
- Common name
- Febuxostat Impurity 106
- Chemical name
- ethyl 2-[3-carbamoyl-4-(2-methylpropoxy)phenyl]-4-methyl-1,3-thiazole-5-carboxylate
- CAS
- 1346238-15-0
- SMILES
- CCOC(=O)c1sc(-c2ccc(OCC(C)C)c(C(N)=O)c2)nc1C
- InChI
- InChI=1S/C18H22N2O4S/c1-5-23-18(22)15-11(4)20-17(25-15)12-6-7-14(24-9-10(2)3)13(8-12)16(19)21/h6-8,10H,5,9H2,1-4H3,(H2,19,21)
- InChIKey
- RPGOULKEZFWRJP-UHFFFAOYSA-N
- Associated API
- Febuxostat
Record ID: A1b0948313518
Computed properties
C18H22N2O4S Molecular formula
362.451 g/molMolecular weight
362.13 DaMonoisotopic exact mass
91.51 ŲTopological polar surface area
3.4289 Calculated LogP (Wildman–Crippen)
97.0944 cm³/molMolar refractivity (Wildman–Crippen)
6 countHydrogen-bond acceptors
1 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 | 362.451 | 60.99 |
| Calculated LogP (Wildman–Crippen) | 3.4289 | 69.64 |
| Topological polar surface area | 91.51 | 66.52 |
| Hydrogen-bond acceptors | 6 | 75.83 |
| Hydrogen-bond donors | 1 | 38.08 |
| Rotatable bonds (strict) | 7 | 76.94 |
Complete molecular descriptors
| Property | Calculated value | Unit / type |
|---|---|---|
| Molecular formula | C18H22N2O4S | dimensionless |
| Molecular weight | 362.451 | g/mol |
| Monoisotopic exact mass | 362.13 | Da |
| Topological polar surface area | 91.51 | Ų |
| Calculated LogP (Wildman–Crippen) | 3.4289 | dimensionless |
| Molar refractivity (Wildman–Crippen) | 97.0944 | cm³/mol |
| Hydrogen-bond acceptors | 6 | count |
| Hydrogen-bond donors | 1 | count |
| Rotatable bonds (strict) | 7 | count |
| Heavy atoms | 25 | count |
| Heteroatoms | 7 | count |
| Rings | 2 | count |
| Aromatic rings | 2 | count |
| Aliphatic rings | 0 | count |
| Saturated rings | 0 | count |
| Aromatic heterocycles | 1 | count |
| Aliphatic heterocycles | 0 | count |
| Saturated heterocycles | 0 | count |
| Aromatic carbocycles | 1 | count |
| Aliphatic carbocycles | 0 | count |
| Fraction of sp³ carbon atoms | 0.3889 | 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 | 150.523 | Ų |
| Valence electrons | 134 | count |
| Radical electrons | 0 | count |
| Bertz complexity | 783.3784 | index |
| Balaban J | 2.3676 | 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 Febuxostat Impurity 106
Qualification and safety assessment of Febuxostat Impurity 106
Explore toxicological qualification of Febuxostat Impurity 106 and ICH M7 mutagenic impurity assessment of Febuxostat Impurity 106 for evaluation of this impurity in its pharmaceutical context.
Where data gaps need to be addressed, resources include read-across assessment for Febuxostat Impurity 106 and acceptable intake and limit justification for Febuxostat Impurity 106. 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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