Desmethylazelastine is a main active metabolite of Azelastine that is oxidatively metabolized by the cytochrome P450 enzyme system with a protein binding rate of 97% and an elimination half-life of 54 hours. Azelastine is an orally active, selective and high-affinity histamine H1-receptor antagonist. Azelastine can be used in studies of allergic rhinitis, asthma, diabetic hyperlipidemic and SARS-CoV-2.

PHA-782584 is a metabolite of sunitinib. Sunitinib is an oral multitargeted tyrosine kinase inhibitor with antitumor activities.

Sonidegib metabolite M48 is the main circulating metabolite of Sonidegib. Sonidegib is a hedgehog pathway inhibitor. M48 showed a much longer Tmax (60 h) than Sonidegib.

Imipramine N-oxide is the metabolite of Imipramine. Imipramine is a tertiary amine tricyclic antidepressant.

14(S)-HDHA (14(S)-HDoHE) is an oxygenation product of Docosahexaenoic acid (DHA). 14(S)-HDHA is a marker reflecting activation of a Docosahexaenoic acid carbon 14-lipoxygenation pathway.

Curcumin monoglucuronide is known as a glucuronic acid conjugate, which is one of the in vivo metabolites of curcumin. Curcumin monoglucuronide is used for research on the metabolism of curcumin and examination of its development as a pharmaceutical. Curcumin monoglucuronide has the potential for the research of cancer disease (extracted from patent WO2022004873A1).

Hydroxy ritonavir is a metabolite of Ritonavir. Ritonavir is an inhibitor of HIV protease used to treat HIV infection and AIDS.

Isokotanin B is a metabolite of bicoumarin isolated from the sclerotia of Aspergillus alliaceus. Isokotanin B shows activity against the corn earworm Helicoverpa zea and the dried fruit bettle Carpophilus hemipterus.

N-Desalkyludenafil is a metabolite of Udenafil. Udenafil is a PDE5 inhibitor used for the research of the erectile dysfunction.

Nordoxepin hydrochloride is the major metabolite of Doxepin. Doxepin is a tricyclic antidepressant that is widely prescribed for the treatment of mild depression.

5-(3-hydroxyphenyl)-5-phenylhydantoin, is a metabolite of anti-seizure agent Phenytoin.

2-Hydroxyemodin is an active metabolite of emodin in the hepatic microsomes. Emodin is an anthraquinone present in fungal metabolites and constituent of rhubarb. 2-Hydroxyemodin proves to be mutagenic to Salmonella typhimurium TA1537 in the absence of activation system.

Resveratrol-3-O-sulfate (sodium) is the metabolite of Resveratrol.

MTIC is the active metabolite of Temozolomide (TMZ). MITC has lower bioavailability in the brain compared with TMZ, because the drug’s permeability through biological barriers and tumor cell membranes affects bioavailability. MITC exhibits low affinity to biological membrane.

SIN-1 (chloride) is the active metabolite of molsidomine. SIN-1 (chloride) exhibits potent vasorelaxant effect and inhibition of platelet aggregation. SIN-1 (chloride) decreases myocardial necrosis and reperfusion-induced endothelial dysfunction in models of myocardial ischemia-reperfusion.

DCBA is a metabolite of insect repellent N-N-diethyl-meta-toluamide (DEET). The concentration of DCBA in urine can assess exposure to DEET.

cPrPMEDAP is an intermediate metabolite of GS-9219. cpr-PMEDAP functions as a prodrug of the guanine nucleotide analog PMEG and has antiproliferative activity. cPrPMEDAP is negatively charged at physiologic pH and has poor permeability into the skin.

DP-1, a degradation product of SDC-TRAP-0063, is a fragment of Ganetespib. Ganetespib is a heat shock protein 90 (HSP90) inhibitor with anti-tumor activity.

Etilevodopa (L-Dopa ethyl ester), an ethyl-ester prodrug of Levodopa, is rapidly hydrolyzed to Levodopa and ethanol by nonspecific esterases in the gastrointestinal tract. Etilevodopa is used for the treatment of Parkinson disease (PD). Levodopa is the direct precursor of dopamine and is a suitable prodrug as it facilitates CNS penetration and delivers dopamine.

N-Desmethyl Clomipramine hydrochloride (Desmethylclomipramine hydrochloride) is a primary plasma N-desmethyl metabolite of Clomipramine. Clomipramine is a tricyclic antidepressant.

Doxorubicinol hydrochloride (13-Dihydroadriamycin hydrochloride) is a secondary alcohol metabolite of Doxorubicin.

Homoeriodictyol is a flavonoid metabolite of Eriocitrin in plasma and urine. Eriocitrin is a strong antioxidant agent.

4-Hydroxyphenylbutazone is a metabolite of Phenylbutazone. Phenylbutazone, a nonsteroidal anti-inflammatory drug (NSAID), is an efficient reducing cofactor for the peroxidase activity of prostaglandin H synthase (PHS).

Iso-Sagittatoside A is the metabolite of effective Erxian Decoction (EXD, a Chinese medicine prescription for menopausal syndromes) in rat plasma.

16α-Hydroxyprednisolone is a stereoselective metabolite of the 22(R) epimer of the glucocorticoid budesonide via cytochrome P450 3A (CYP3A) enzymes.

HMMNI (Hydroxy dimetridazole) is a hydroxy metabolite of Dimetridazole. Dimetridazole is a nitroimidazole class drug that combats protozoan infections.

Paeoniflorgenin is a deglucosylated metabolite of Paeoniflorin.

Homovanillyl alcohol is a biological metabolite of Hydroxytyrosol. Hydroxytyrosol is a phenolic compound that is present in virgin olive oil (VOO) and wine. Homovanillyl alcohol protects red blood cells (RBCs) from oxidative injury and has protective effect on cardiovascular disease.

ω-Hydroxy-DEET is a major metabolite of insect repellent N-N-diethyl-meta-toluamide (DEET). ω-Hydroxy-DEET has anti-proliferative effects. DEET is a spatial repellent and an irritant that commonly used to prevent contact with mosquitoes.

6-Azathymine acid is a metabolite of Pymetrozine. Pymetrozine is active against plant-sucking insects, such as aphids and whiteflies in vegetables, cotton, field crops and fruits and affects the nervous regulation of feeding behavior.