precursor

2-Ketoglutaric acid Sodium (AKG) is a key molecule in the TCA cycle. It can be produced from glutamate by oxidative deamination via glutamate dehydrogenase and as a product of pyridoxal phosphate-dependent transamination reactions (mediated by branched-chain amino acid transaminases) in which glutamate is a common amino donor.

Isophorone is a clear liquid that smells like peppermint. It can be dissolved in water and evaporates somewhat faster than water.

2-Ketoglutaric acid is a reversible inhibitor of tyrosinase (IC50=15 mM). 2-Ketoglutaric acid is an intermediate of the Krebs cycle and can produce either ATP or GTP. 2-Ketoglutaric acid also acts as a major carbon backbone for the nitrogen assimilation reaction.

DL-Tyrosine is a natural product.

Thymidine (DThyd) is a cell synchronizing agent and a specific precursor of deoxyribonucleic acid. Thymidine inhibits DNA synthesis and can cause cell cycle arrest in the G1/S phase.

1. Gypsogenin-3-O-glucuronide (Methyl gypsogenin 3-O-beta-D-glucuronopy) shows inhibitory activity toward pancreatic lipase with IC5 value of .29 mM, and the free carboxylic acid groups in position 28 within its chemical structures are required for enhancement of pancreatic lipase inhibition.

Sclareol glycol, a diterpene diol, is utilized as a precursor in the synthesis of ambroxide. It is characterized by a specific stereochemistry at its (3S,6R,8aS)-configurations, with two hydroxyl groups attached at the [2R,3aR,6S,8aR]-octahydro-3a,6,6,8a-tetramethyl-2-(1-methylethyl) perhydrophenanthrene framework.

L-DOPA (Levodopa) is an orally active metabolic precursor of the neurotransmitter dopamine. It can cross the blood-brain barrier and be converted into dopamine in the brain. L-DOPA exhibits anti-hyperalgesic effects and holds potential in Parkinson’s disease research, and it can also be used to induce Parkinson’s disease models.

Succinic acid (1, 2-ethanedicarboxylic acid) is a product of anaerobic metabolism and an intermediate of the tricarboxylic acid cycle.

Deoxycorticosterone acetate (DOCA) is a steroid hormone produced by the adrenal glands, possessing mineralocorticoid activity and serving as a precursor to aldosterone. As an agonist of the mineralocorticoid receptor, DOCA can induce severe kidney damage, including inflammation, fibrosis, glomerular injury, and proteinuria. It is commonly used to establish animal models of chronic kidney injury and hypertension.

Glucosamine (Chitosamine) is a natural product. Glucosamine is used as a dietary supplement. Glucosamine has pharmacological effects on cartilage and chondrocytes in osteoarthritis when used externally. Glucosamine regulates sugar metabolism. Glucosamine reduces the activity of glucoskinase in pancreatic islet homogenate.

L-Tryptophan (Tryptophane), an essential amino acid, is necessary for normal growth in infants and for nitrogen balance in adults. It is a precursor of SEROTONIN (hence its use as an antidepressant and sleep aid) and of INDOLE ALKALOIDS in plants. It can be a precursor to NIACIN, although inefficiently in mammals.

D-Phenylalanine, a necessary aromatic amino acid, is a precursor of thyroxine, dopamine, melanin, and noradrenaline (norepinephrine).

Cholesterol is the primary sterol in mammals, accounting for approximately 20–25% of the plasma membrane structure. It plays a key role in regulating membrane fluidity, permeability, and protein function. As an endogenous agonist of estrogen-related receptor α (ERRα), cholesterol is widely involved in metabolic regulation and serves as a precursor for the synthesis of hormones and bile acids. It is commonly used in experimental models of hyperlipidemia.

Coumarin is a chemical compound poison found in many plants, notably in high concentration in the tonka bean, woodruff, and bison grass. It has clinical value as the precursor for several anticoagulants, notably warfarin.

Nicotinamide, a vitamin B3 derivative, is an inhibitor of SIRT1 (IC50=50-180 μM) and SIRT2 (IC50=2 μM). Nicotinamide can be used as a precursor of nicotinamide adenine dinucleotide or NAD+, which can be supplemented by dietary intake and can prevent or treat melanoglossia and pellagra.

5,6-Dihydroxyindole (Dopamine lutine) is a melanin precursor and has a broad-spectrum antibacterial, antiviral, antifungal, antiparasitic activity. It has cytotoxic effects and is strongly toxic against various pathogens.

Choline chloride (Biocoline) is a basic constituent of lecithin that is found in many plants and animal organs. It is important as a precursor of acetylcholine, as a methyl donor in various metabolic processes, and in lipid metabolism.

Guaiacol (2-Methoxyphenol) is a precursor to various flavorants, such as eugenol and vanillin. Its derivatives are used medicinally as an expectorant, antiseptic, and local anesthetic. It also can be used as an indicator in chemical reactions that produce oxygen. When oxygen binds to it, the complex turns yellowish brown and absorbs light maximally at about 470 nm.

DL-Mevalonolactone, a human endogenous metabolite, is the δ-lactone form of mevalonate, a precursor of the mevalonate pathway. It reduces mitochondrial membrane potential (∆Ψm), Ca2+ retention and NAD(P)H levels in the brain, and also induces mitochondrial swelling.DL-Mevalonolactone induces inflammation and oxidative stress, and reduces mitochondrial membrane potential.

N-Acetyl-5-hydroxytryptamine (O-Demethylmelatonin) , also known as Normelatonin, is the immediate precursor of melatonin. It is produced from serotonin by the enzyme aralkylamine N-acetyltransferase and is converted to melatonin by acetylserotonin O-methyltransferase. It can potently activate TrkB receptor.

L-5-Hydroxytryptophan (L-5-HTP) is a naturally occurring amino acid and dietary supplement that serves as a precursor to the neurotransmitter serotonin. It can be used as an antidepressant, appetite suppressant, and sleep aid, and acts as an antagonist to reserpine. L-5-HTP is widely used in research on myoclonus, fibromyalgia, migraine, and cerebellar ataxia, and is also commonly used to induce epilepsy models.

D-Panthenol (D-Pantothenyl alcohol) is an alcoholic analogue of D-pantothenic acid and cholinergic agent. D-Panthenol acts as a precursor of coenzyme A necessary for acetylation reactions and is involved in the synthesis of acetylcholine. Although the exact mechanism of the actions of D-Panthenol is unclear, it may enhance the effect of acetylcholine. D-Panthenol acts on the gastrointestinal tract and increases lower intestinal motility. It is also applied topically to the skin to relieve itching and to promote healing.

Cytidine (Cytosine-1-β-D-ribofuranoside) is a pyrimidine nucleoside comprised of a cytosine bound to ribose via a beta-N1-glycosidic bond. Cytidine is a precursor for uridine. Both cytidine and uridine are utilized in RNA synthesis.