2-o-β-d-glucopyranosyl-l-ascorbic acid

2-O-β-D-Glucopyranosyl-L-ascorbic acid (AA-2βG), isolated from Lycium Fruit, is a stable vitamin C analog with anti-tumor activity.

2-Hydroxycinnamic acid is a natural product isolated from Angraecum fragrans, has photooxidant activity.

2-Hydroxy-6-methoxybenzoic acid (6-Methoxysalicylic acid) may be employed as internal standard for the determination of acetylsalicylic acid (aspirin, ASA) and its major metabolite, salicylic acid (SA),and exhibits significant analgesic effects

(E)-Oct-2-enoic acid (2-Octenoate) is an organic acid produced by hepatic microsomal oxidation of aliphatic aldehydes and is a metabolite naturally present in urine and plasma.

1. 2-Methoxycinnamic acid (o-Methoxycinnamic acid) can enhance inhibition of tyrosinase activity.

2-METHYLVALERIC ACID is a natural product.

O-Phospho-L-serine (Phosphoserine) is the phosphoric acid ester of serine.

D-(-)-Tartaric acid (D-Tartaric acid; (S, S)-tartarate; D-threaric acid) is mainly located in the cytoplasm. D-(-)-Tartaric acid can be converted into (2S,3S)-cis-fertaric acid and (2S,3S)-trans-fertaric acid. Outside the human body, it can be found in vinegar. This makes it a potential biomarker for the consumption of this food.

2-Hydroxyoctanoic acid is a medium-chain acyl-coenzyme A synthetase inhibitor (Ki:500 μM). 3-Hydroxymandelic acid is a protein hydrolysis product of larger proteins.

1-Hydroxy-2-naphthoic acid (ALPHA-HYDROXYNAPHTHOIC ACID) is a Metabolite from phenanthrene degradation.

D-(+)-Phenyllactic acid (D-3-Phenyllactic acid), an antibacterial compound produced by Geotrichum candidum, effectively inhibits various Gram-positive and Gram-negative bacteria originating from humans and food products[1].

o-Toluic acid, also 2-methylbenzoic acid, is an aromatic carboxylic acid. It is a human xenobiotic metabolite.

Anthraquinone-2-carboxylic acid acts as a potent anti-inflammatory and antinociceptive component in vivo, thus contributing to the immune regulatory role of fruits and herbs.

2-(4-Methoxyphenyl)acetic acid, a plasma metabolite, is highly sensitive and specific and can be used as a bioindicator to differentiate non-small cell carcinoma patients from healthy controls.

L-Ascorbic acid (Vitamin C) is a natural product that is a potent reducing agent and antioxidant. L-Ascorbic acid functions in fighting bacterial infections, in detoxifying reactions, and in the formation of collagen. L-Ascorbic acid is used in the treatment of scurvy.

2-Hydroxyisobutyric acid (α-Hydroxyisobutyric acid) is a metabolite of methyl tert-butyl ether (MTBE). MTBE may be obtained through environmental exposure. MTBE is rapidly eliminated from the body, mainly through expired air as the unchanged compound. MTBE is to some extent metabolised to t-butyl alcohol (TBA) and formaldehyde and oxidised to 2-methyl-1,2-propanediol and a-hydroxy isobuturic acid. 2-Hydroxyisobutyric acid has been used as an arial bactericide.

2-Furoic acid (Furan-2-carboxylic acid) reduces serum cholesterol and triglyceride levels and exhibits anti-lipidemic effects.

Pyrrole-2-carboxylic acid (Minaline) was first identified as a degradation product of sialic acids, then as a derivative of the oxidation of the D-hydroxyproline isomers by mammalian D-amino acid oxidase. The latter relationship results from the lability of the direct oxidation product, A'-pyrroline-4-hydroxy-2-carboxylic acid, which loses water spontaneously to form the pyrrole. A similar reaction is catalyzed by the more specific allohydroxy-D-proline oxidase of Pseudomonas. In whole animal observations, pyrrole-2-carboxylate (PCA) ' was identified in rat or human urine after administration of the D-isomers of hydroxyproline, a finding ascribable to the action of D-amino acid oxidase. Urinary excretion of N-(pyrrole-2-carboxyl) glycine has been reported in a 5-year-old affected with type II hyperprolinemia; The child has mild developmental delay, recurrent seizures of the grand mal type and EEG alterations.

L-Glutamic acid monosodium salt (MSG) (Monosodium glutamate) is an activator of mGlu1 receptor.

D-Glucaric acid potassium (D-Saccharic acid potassium salt) is a compound formed from oxidizing sugars, which can be used to test for the presence of hepatic enzyme induction. Studies indicate that D-glucuronolactone dehydrogenase oxidizes D-Saccharic acid potassium salt into D-glucaro-l,4;6,3-dilactone. Alternate studies suggest that D-Saccharic acid potassium salt forms a complex with Cu(II) and H2O2to decolorize azo, acridine, triphenyl methane, anthraquinone and thiazine-based dyes.

2-Hydroxystearic acid is a hydroxy fatty acid found in humans and U. armoricana. It reduces the growth of Ehrlich ascites tumor (EAT) cells in vitro when used at a concentration of 100 μM.

2-Hydroxy-4-methoxybenzoic acid (2-Hydroxy-p-anisic Acid) is a predicted metabolite generated by BioTransformer1 that is produced by the metabolism of 3-(2-hydroxy-4-methoxyphenyl)propanoic acid. It is generated by unspecified-gutmicro enzyme via a beta-oxidation-of-carbxoylic-acid reaction. This beta-oxidation-of-carbxoylic-acid occurs in human gut microbiota.

D-Pantothenic acid (vitamin B5) is a water-soluble vitamin ubiquitously found in plants and animal tissues with an antioxidant property. D-Pantothenic acid is a component of coenzyme A (CoA) and a part of the vitamin B2 complex. D-Pantothenic acid is a growth factor and is essential for various metabolic functions, including the metabolism of carbohydrates, proteins, and fatty acids. This vitamin is also involved in the synthesis of cholesterol, lipids, neurotransmitters, steroid hormones, and hemoglobin.

2-Phenylbutanoic acid (2-Phenylbutyric acid) is used as an industrial intermediate.

L-Azetidine-2-carboxylic acid ((2S)-azetidine-2-carboxylic acid) is a toxic proline analogue produced by members of the Liliaceae and Agavaciae families.

L-Ascorbic acid sodium salt (Vitamin C sodium salt) is a more bioavailable form of vitamin C that is an alternative to taking ascorbic acid as a supplement.

2-Hydroxy-2-methylbutyric acid is an unusual metabolite found in the urine of patients with 2-hydroxyglutaric aciduria and maple syrup urine disease.

N-Acetyl-L-glutamic acid (Ac-L-Glu-OH) (NAcGlu) is an acetylated amino acid. NAcGlu is biosynthesized from glutamic acid and acetyl-CoA by the enzyme N-acetyl glutamate synthase (NAGS). NAcGlu activates carbamoyl phosphate synthetase in the urea cycle. A deficiency in N-acetyl glutamate synthase or a genetic mutation in the gene coding for the enzyme will lead to urea cycle failure in which ammonia is not converted to urea, but rather accumulated in the blood leading to the condition called Type I hyperammonemia.

D-Glucuronic acid lactone (Dicurone) is a naturally occurring chemical that is an important structural component of nearly all connective tissues. Glucuronolactone is also found in many plant gums.

2-Hydroxyhexanoic acid (2-Hydroxycaproic acid) is a branched-chain alpha-keto acid that has been reported in normal human blood and in normal amniotic fluid. It has been found that 2-Hydroxyhexanoic acid is the most significant metabolite found in the CSF of patients infected with Nocardia.

O-Acetylserine (OASS) is an acylated amino acid derivative. It is an intermediate in the biosynthesis of the common amino acid cysteine in bacteria and plants. Its presence in humans arises from either microbial metabolism in the gut or through consumptio

D-Pantothenic acid hemicalcium salt (Calcium pantothenate), a kind of water soluble vitamin, can reduce the patulin content of the apple juice.

2-Methylhexanoic acid is a flavouring ingredient.

L-Pipecolic acid (L-Homoproline) is a breakdown product of lysine, accumulates in body fluids of infants with generalized genetic peroxisomal disorders, such as Zellweger syndrome, neonatal adrenoleukodystrophy.

D-(-)-Quinic acid (Kinic acid) is a cellular metal ion chelator, capable of promoting reactions with metal M(II,III) ions under pH-specific conditions. It may possess potent inhibition against alpha-mannosidase and alpha-fucosidase.

L-Aspartic acid (Aspatofort) is a non-essential amino acid in humans, L-Aspartic acid has an overall negative charge and plays an important role in the synthesis of other amino acids and in the citric acid and urea cycles. Asparagine, arginine, lysine, methionine, isoleucine, and some nucleotides are synthesized from aspartic acid. L-Aspartic acid also serves as a neurotransmitter.

trans-2-Undecenoic acid ((E)-Undec-2-enoic acid) ((E)-2-Undecenoic acid) is an α,β-unsaturated carboxylic acid characterized by acid dimers.

(E)-2-Methyl-2-pentenoic acid, characterized by its sweet berry-like aroma and flavor, is widely utilized in food flavoring.

2-Hydroxyphenylacetic acid (Ortho-Hydroxyphenylacetic acid) can be found in a number of food items such as natal plum, lemon verbena, half-highbush blueberry, and parsley, which makes 2-Hydroxyphenylacetic acid a potential biomarker for the consumption of these food products. 2-Hydroxyphenylacetic acid (Ortho-Hydroxyphenylacetic acid) can be found primarily in blood, feces, and urine.

(R)-5-Oxopyrrolidine-2-carboxylic acid (D-Pyroglutamic acid) is a cyclic derivative of glutamic acid, physiologically present in mammalian tissues. It releases GABA from the cerebral cortex and exhibits anti-anxiety effects in a simple approach-avoidance conflict situation in rats. In clinical pharmacology experiments, it significantly shortens the plasma half-life of ethanol during acute intoxication.

2-Methyl-4-pentenoic Acid (2-Methylpent-4-enoic acid) is a branched-chain fatty acid.

D-Glutamic acid ((R)-Glutamic acid), the enantiomer of L-glutamic acid, is widely used in medicine and food.

D-Glucuronic acid sodium salt monohydrate (Sodium D-glucuronate) is a carboxylic acid that is highly soluble in water. In humans, glucuronic acid often binds to toxic substances to facilitate elimination and to hormones to aid in their transport.

(E)-2-Butenoic acid (Crotonic acid) is fatty acid formed by the action of fatty acid synthases from acetyl-CoA and malonyl-CoA precursors. Crotonic acid is involved in the fatty acid biosynthesis. Crotonic acid is also found in water extracts from carrot seeds (Daucus carota L.).

2-Deoxy-2-sulfoamino-D-glucose sodium (GlcN-2S) can potentially influence arthritis.

(R)-pyrrolidine-2-carboxylic acid (D-Proline) is an isomer of the naturally occurring amino acid L-Proline. D-amino acids, including D-Proline, are found in relatively high abundance in human plasma and saliva, potentially originating from bacterial sources or endogenous production via amino acid racemase activity.

L-Lactic acid ((S)-2-Hydroxypropanoic acid) is a natural product produced by the anaerobic glycolysis of pyruvic acid. L-Lactic acid is a sensitive indicator of tissue hypoxia and can be used as a hemodynamic indicator in critically ill patients.

(Z)-4-Amino-4-oxobut-2-enoic acid (Maleamic acid) is a valuable compound for research applications.

4-Methyl-2-oxopentanoic acid is an abnormal metabolite, a neurotoxin and a metabolic toxin.

L-Cysteic acid monohydrate (3-Sulfo-L-alanine Monohydrate) is an oxidation product of L-cysteine that may be used as a competitive inhibitor of the bacterial aspartate: alanine antiporter (AspT) exchange of aspartate and in other aspartate biological systems. L-Cysteic acid monohydrate is used in monomeric surfactant development. L-Cysteic acid monohydrate may be used in studies of excitatory amino acids in the brain, such as those that bind to cysteine sulfinic acid receptors. It is a useful agonist at several rat metabotropic glutamate receptors (mGluRs).