Pharmaceutical impurity

Sorafenib Impurity 43

Sorafenib Impurity 43 is listed in the pharmaceutical impurity collection under CAS 757251-59-5. Its represented structure has formula C13H12N2O3 and a calculated molecular weight of 244.25 g/mol.

2D chemical structure

Chemical identity

Catalog name: Sorafenib Impurity 43
Common name: Sorafenib Impurity 43
Chemical name: methyl 4-(4-aminophenoxy)pyridine-2-carboxylate
CAS: 757251-59-5
SMILES: COC(=O)c1cc(Oc2ccc(N)cc2)ccn1
InChI: InChI=1S/C13H12N2O3/c1-17-13(16)12-8-11(6-7-15-12)18-10-4-2-9(14)3-5-10/h2-8H,14H2,1H3
InChIKey: LKNOOBDGFHXDIE-UHFFFAOYSA-N
Associated API: Sorafenib

Record ID: A08839afb86c2

Computed properties

C13H12N2O3 Molecular formula

244.25 g/molMolecular weight

244.0848 DaMonoisotopic exact mass

74.44 Å²Topological polar surface area

2.2427 Calculated LogP (Wildman–Crippen)

66.5049 cm³/molMolar refractivity (Wildman–Crippen)

5 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

Descriptor radar

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	244.25	28.72
Calculated LogP (Wildman–Crippen)	2.2427	47.12
Topological polar surface area	74.44	53.15
Hydrogen-bond acceptors	5	65.12
Hydrogen-bond donors	1	38.08
Rotatable bonds (strict)	3	37.08

Complete molecular descriptors

Property	Calculated value	Unit / type
Molecular formula	C13H12N2O3	dimensionless
Molecular weight	244.25	g/mol
Monoisotopic exact mass	244.0848	Da
Topological polar surface area	74.44	Å²
Calculated LogP (Wildman–Crippen)	2.2427	dimensionless
Molar refractivity (Wildman–Crippen)	66.5049	cm³/mol
Hydrogen-bond acceptors	5	count
Hydrogen-bond donors	1	count
Rotatable bonds (strict)	3	count
Heavy atoms	18	count
Heteroatoms	5	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	0.0769	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	104.1665	Å²
Valence electrons	92	count
Radical electrons	0	count
Bertz complexity	552.4177	index
Balaban J	2.1875	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 Sorafenib Impurity 43

Qualification and safety assessment of Sorafenib Impurity 43

Explore toxicological qualification of Sorafenib Impurity 43 and ICH M7 mutagenic impurity assessment of Sorafenib Impurity 43 for evaluation of this impurity in its pharmaceutical context.

Where data gaps need to be addressed, resources include read-across assessment for Sorafenib Impurity 43 and acceptable intake and limit justification for Sorafenib Impurity 43. The relevant approach depends on the available evidence, exposure and duration of use.

Related Altox services and technical resources

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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