precursor

L-DOPA (Levodopa) is an amino acid precursor of dopamine with antiparkinsonian properties. It is a prodrug converted to dopamine by DOPA decarboxylase and can cross the blood-brain barrier. In the brain, levodopa is decarboxylated to dopamine, stimulating dopaminergic receptors and compensating for depleted endogenous dopamine in Parkinson's disease. To ensure adequate concentrations reach the central nervous system, levodopa is administered with carbidopa, a decarboxylase inhibitor that does not cross the blood-brain barrier, reducing peripheral decarboxylation and increasing CNS dopamine delivery.

Succinic acid (1,2-Ethanedicarboxylic acid) is a water-soluble, colorless crystal with an acid taste that is used as a chemical intermediate, in medicine, the manufacture of lacquers, and to make perfume esters. It is also used in foods as a sequestrant, buffer, and a neutralizing agent.

Deoxycorticosterone acetate (Cortexone acetate) is the 21-acetate derivative of desoxycorticosterone, used for intramuscular injection for replacement therapy of the adrenocortical steroid.

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 key molecule in the tricarboxylic acid cycle,is also connected to glutamic acid and glutamine metabolisms through the transamination reactions.

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.

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.

Glucosamine (Chitosamine) is an amino sugar and a prominent precursor in the biochemical synthesis of glycosylated proteins and lipids. Supplemental glucosamine may help to rebuild cartilage and treat arthritis.

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).

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.

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), the immediate precursor in the biosynthesis of SEROTONIN from tryptophan, is used as an antiepileptic and antidepressant.

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.

β-Carotene (Provitamin A) is a naturally-occurring retinol (vitamin A) precursor obtained from certain fruits and vegetables with potential antineoplastic and chemopreventive activities. As an anti-oxidant, beta carotene inhibits free-radical damage to DNA.

Dopamine hydrochloride (ASL279), a naturally occurring catecholamine formed by decarboxylation of dihydroxyphenylalanine and a precursor of norepinephrine and epinephrine, binds to alpha-1- and beta-1- adrenergic receptors.

5-Aminolevulinic acid hydrochloride (5-ALA) is an intermediate in heme biosynthesis and a universal precursor of tetrapyrroles.

L-Aspartic aicd sodium (Sodium L-aspartate) is an amino acid, a precursor active molecule for colon-specific active molecule delivery, that promotes Na+ efflux from rat forebrain membrane vesicles.