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Drug impurities are process-related compounds and degradation products linked to specific drug substances. Most entries carry the name of their parent drug and arise from starting materials, side reactions or breakdown during storage. ABZ-amine is related to the anthelmintic albendazole, and olanzapine ketolactam is a degradation product of olanzapine. The range extends from cetirizine methyl ester, an ester of the antihistamine cetirizine, to Calcitriol Impurities D and Gefitinib impurity 2. Researchers use such compounds in impurity profiling, in identifying unknown chromatographic peaks and in studies of degradation pathways. Environmental contaminants and stereoisomers of research compounds are grouped under Impurities & Reference Standards instead.
Olanzapine ketolactam is an impurity associated with Olanzapine, a selectively acting monoaminergic antagonist. This compound may be utilized in chemical research to study the structural and functional properties of Olanzapine and its metabolites. Its presence could provide insights into the pharmacological profiles and safety assessments of olanzapine formulations.
Cetirizine methyl ester is a known impurity of Cetirizine, a second-generation antihistamine that functions as a selective, orally active, and long-lasting antagonist of the histamine H1 receptor. This compound serves as an important analytical reference for the study of Cetirizine's purity and quality control processes. Its relevance in biochemical research and pharmaceutical development makes it a valuable tool for investigating the pharmacological profile of antihistamines.
Keto Ziprasidone is a known impurity of the antipsychotic agent Ziprasidone, which functions primarily as a combined antagonist of serotonin (5-HT) and dopamine receptors. This compound is crucial for research applications focusing on drug metabolism and pharmacokinetics, particularly in understanding the potential effects of impurities on therapeutic efficacy and safety profiles. Its analysis can aid in the development of quality control measures in pharmaceutical formulations.
Hydroxy ziprasidone is a known impurity of the antipsychotic agent ziprasidone, which functions primarily as a combined antagonist of both serotonin (5-HT) and dopamine receptors. This compound is useful for researchers studying the pharmacological properties and metabolic pathways of ziprasidone, as well as for quality control in the synthesis of pharmaceutical formulations. Its presence can provide insights into the drug's safety, efficacy, and potential side effects.
Synonyms: Methotrexate 5-methyl ester; γ-EMTX
Methotrexate γ-Methyl Ester is an impurity of the folate antagonist Methotrexate, specifically identified as Methotrexate 5-methyl ester. This compound is utilized in chemical research to study the properties and potential effects of Methotrexate derivatives. It serves as a valuable tool for understanding the metabolism and biochemical activity of folate-related compounds in various biological systems.
(±)-Darifenacin N-Oxide is an impurity of the selective M3 muscarinic receptor antagonist Darifenacin. This compound may serve as a reference standard in analytical chemistry and pharmacological studies involving Darifenacin. Its characterization is crucial for ensuring the purity and efficacy of Darifenacin in various research applications.
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Labetalone hydrochloride is an impurity of Labetalol, an orally active adrenoceptor blocking agent. It functions as a competitive antagonist at both alpha- and beta-adrenoceptor sites, contributing to the pharmacological profile of Labetalol. This compound is primarily used in research applications related to cardiovascular pharmacology and the study of adrenoceptor interactions.
Deschloro Cetirizine dihydrochloride is an impurity of Cetirizine, a second-generation antihistamine and a carboxylated metabolite of hydroxyzine. This compound acts as a selective and orally active histamine H1-receptor antagonist, exhibiting long-lasting antihistaminic effects. It is primarily used in biochemical research aimed at understanding the purity and composition of antihistamine formulations.
1H-1-Ethyl Candesartan Cilexetil is an impurity associated with the synthesis of Candesartan Cilexetil, an angiotensin II receptor antagonist. This compound may serve as a critical reference standard in the quality control of pharmaceutical formulations containing Candesartan Cilexetil. Its presence and characterization are essential for ensuring the safety and efficacy of products within the cardiovascular therapeutic landscape.
Risperidone E-oxime is a recognized impurity of Risperidone, primarily targeting serotonin 5-HT2 receptors and dopamine D2 receptors. This compound acts as a serotonin 5-HT2 receptor blocker and a potent dopamine D2 receptor antagonist, exhibiting inhibition constants (Kis) of 4.8 nM and 5.9 nM, respectively. It is particularly relevant for studies involving antipsychotic drug development, pharmacokinetics, and the assessment of metabolite profiles.
D-Valsartan is an impurity of Valsartan, which functions primarily as an angiotensin II receptor antagonist. It plays a critical role in the characterization of Valsartan and is essential for purity assessments during pharmaceutical development. This compound serves as a reference in research applications aimed at understanding the pharmacological profile and safety of angiotensin II receptor modulators.
(S)-Ponesimod is a chiral impurity associated with the selective S1P receptor modulator, Ponesimod. Its presence is relevant in the development and quality control of therapeutic formulations targeting autoimmune diseases. Research applications include assessing drug purity and understanding the pharmacokinetics of S1P receptor modulators.
2-Cyano-1,3-dimethylguanidine is a known impurity of Cimetidine, a histamine H2-receptor antagonist. This compound may be utilized in analytical studies to assess the purity and quality of pharmaceutical formulations containing Cimetidine. Its presence can provide insights into the synthesis and stability of related drug compounds in research applications.
N-Trityl candesartan cilexetil is identified as a drug impurity associated with the angiotensin II receptor antagonist class of compounds. Its presence may affect the pharmacological profile and efficacy of the primary drug. This reagent is valuable for analytical studies in drug development and quality control, particularly in evaluating the purity of candesartan cilexetil formulations.
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Trityl candesartan cilexetil is a minor drug impurity of candesartan cilexetil, an angiotensin II receptor antagonist. This compound may be utilized for analytical and quality control purposes in pharmaceutical research, especially in studies assessing the purity and stability of candesartan formulations. Its role as a reference standard in method development and validation makes it significant for ensuring the integrity of pharmaceutical products.
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