principal

N-Acetylcarnosine (N-Acetyl-L-carnosine) is thought to be able to combat some of the effects of oxidative stress as it has anti-oxidant properties.

Bilirubin (Principal bile pigment) is a type of bile pigment, which is a metabolite of hemoglobin in the blood. Bilirubin has antimutagenic and antioxidant effects. Bilirubin is an important basis for clinical determination of jaundice, and is also an important indicator of liver function.

Endoxifen hydrochloride, a principal active metabolite of Tamoxifen (TAM), exhibits heightened affinity and specificity towards the estrogen receptor and possesses aromatase inhibitory capability. It holds promise for breast cancer research.

Urea (Carbonyldiamide) is formed in the liver from ammonia produced by the deamination of amino acids. It is the principal end metabolite of protein catabolism and accounts for about one-half of the total urinary solids.

5-Methyltetrahydrofolic acid (5-Methyl THF) is a biologically active form of folic acid and a methylated derivative of tetrahydrofolate, serving as the predominant natural dietary folate and the principal form of folate found in plasma and cerebrospinal fluid.

Thymol, also known as Pseudoaspidin, is a principal monoterpene phenol found in the essential oils of plants from the Lamiaceae family, along with several other families including Verbenaceae, Scrophulariaceae, Ranunculaceae, and Apiaceae. This compound exhibits antioxidant, anti-inflammatory, antibacterial, and antifungal properties.

Phosphorylcholine chloride calcium salt tetrahydrate (Phosphocholine chloride calcium salt tet) is a small haptenic molecule, is found in a wide variety of organisms. Human hepatic tumors undergo an elevation in the concentration of phosphorylcholine as the principal metabolic change is observed (PMID: 11076016 ). Phosphorylcholine chloride calcium salt tetrahydrate is the precursor metabolite of choline in the glycine, serine and threonine metabolism pathways (KEGG, map00260) and in intermediate between choline and cytidine-diphosphate choline in the glycerophospholipid metabolism pathway (KEGG, map00564).

Teriflunomide (A 77-1726) is the principal active metabolite of leflunomide, an approved therapy for rheumatoid arthritis and multiple sclerosis.

Nickel(II) oxide is the chemical compound with the formula NiO. It is the principal oxide of nickel.

Transferrin fragment acetate is the principal ironbinding protein in animal serum and is analogous in its iron-binding site and properties to lactoferrin1.

Amiloride hydrochloride dihydrate (Amiloride HCl dihydrate) is a pyrazine compound inhibiting SODIUM reabsorption through SODIUM CHANNELS in renal EPITHELIAL CELLS. This inhibition creates a negative potential in the luminal membranes of principal cells, located in the distal convoluted tubule and collecting duct. Negative potential reduces secretion of potassium and hydrogen ions. Amiloride hydrochloride dihydrate is used in conjunction with DIURETICS to spare POTASSIUM loss.

(-)-Hydroxycitric acid (Garcinia acid) is the principal acid found in the fruit rinds of Garcinia cambogia. It acts as a potent and competitive inhibitor of ATP citrate lyase, suppressing fatty acid synthesis, food intake, lipogenesis, and inducing weight loss.

N-Desmethyltamoxifen, the principal metabolite of tamoxifen in humans, serves as an efficacious modulator of ceramide metabolism within human AML cells by inhibiting ceramide glycosylation, hydrolysis, and sphingosine phosphorylation. Although it demonstrates weak antiestrogenic properties, it acts as a protein kinase C (PKC) inhibitor with a potency ten times greater than that of tamoxifen.

2-Methoxyestrone is a methoxylated catechol estrogen and the principal metabolite of 2-hydroxyestrone [a nonuterotropic metabolite of estradiol].

MD 770222, the principal plasma O-demethylated metabolite of Cimoxatone, is an orally active selective and reversible inhibitor of MAO A. The potency of MD 770222 is lower than that of Cimoxatone.

Noradrenaline tartrate is an effective adrenergic receptor agonist that activates α1, α2, and β1 receptors. It is a precursor of epinephrine and serves as the principal neurotransmitter of most postganglionic sympathetic fibers and the diffuse projection system in the brain originating from the locus coeruleus, and can be used to establish cardiomyopathy models.

Alpha 2 Antiplasmin serves as the principal circulating inhibitor of plasmin. This compound plays a crucial role in regulating fibrinolysis within blood vessels.

ENDOTHELIN-1 (ET-1), the principal peptide of the endothelin family, has been shown to have a variety of biological activities in both vascular and nonvascular tissues. The C-terminal fragment, which is a highly conserved sequence in the peptides of t

Ac-Endothelin-1 (16-21), human acetate, the principal peptide of the endothelin family, has been shown to have a variety of biological activities in both vascular and nonvascular tissues. The C-terminal fragment, which is a highly conserved sequence in th

Varenicline Hydrochloride (CP 526555) is an orally active partial agonist of the α4β2 nicotinic acetylcholine receptor (α4β2 nAChR, IC50 = 250 nM), which is recognized as the principal mediator of nicotine dependence, and its pharmacological effect is critical in modulating addictive behaviors associated with nicotine exposure. Varenicline Hydrochloride (CP 526555) blocks the direct agonist effects of nicotine on nicotinic acetylcholine receptors while simultaneously stimulating these receptors in a more moderate and controlled manner, making it a widely used research compound in smoking cessation.

Scaff10-8 is an inhibitor of AKAP-Lbc-RhoA interaction that acts by promoting the translocation of aquaporin-2 to the plasma membrane of renal collecting duct principal cells.

Repin, a plant responsible for Parkinson-like disease in horses, is the principal sesquiterpene lactone extracted from Russian knapweed.

Ceramide phosphoethanolamine (CPE) is an analog of sphingomyelin that contains ethanolamine rather than choline as the head group. It is the principal membrane phospholipid in invertebrates such as Drosophila, which lacks sphingomyelin. It is only produced in small amounts in mammalian cells, accounting for approximately 0.02 mol% of total phospholipids in mouse testis and brain. In Drosophila, CPE is biosynthesized by CPE synthase from ceramide and cytidine diphosphate-ethanolamine in the Golgi lumen. In mammals, it is biosynthesized by sphingomyelin synthase 2 (SMS2) in the plasma membrane and by sphingomyelin synthase-related protein (SMSr) in the endoplasmic reticulum (ER). In Drosophila, CPE has a role in glial ensheathment of axons. Disrupting CPE synthesis by depleting SMSr in vitro in mammalian cells leads to an accumulation of ER ceramides, which are then mislocalized to the mitochondria, inducing apoptosis. However, ceramide levels are not altered in transgenic mice lacking SMSr catalytic activity. CPEs (bovine) is a mixture of CPEs with variable N-acyl chain lengths.

2-hydroxymethyl benzoic acid is an endogenous metabolite.