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Phenyllactic acid a product of phenylalanine catabolism, appearing prominently in the urine in individuals with phenylketonuria. Levels of several phenylalanine metabolites, including phenylacetate (PAA), phenyllactate (PLA), and phenylpyruvate (PPA)) are elevated in Phenylketonuria (PKU) (OMIM 261600). Phenyllactic acid is likely produced from phenylpyruvate via the action of lactate dehydrogenase. The D-form of this organic acid is typically derived from bacterial sources while the L-form is almost certainly endogenous. Levels of phenyllactate are normally very low in blood or urine. High levels of PLA in the urine or blood are often indicative of phenylketonuria (PKU) and hyperphenylalaninemia (HPA). PKU is due to lack of the enzyme phenylalanine hydroxylase (PAH), so that phenylalanine is converted not to tyrosine but to phenylpyruvic acid (a precursor of phenylactate). In particular, excessive phenylalanine is typically metabolized into phenylketones through, a transaminase pathway route involving glutamate. Metabolites of this transamination reaction include phenylacetate, phenylpyruvate and phenethylamine. In persons with PKU, dietary phenylalanine either accumulates in the body or some of it is converted to phenylpyruvic acid and then to phenyllactate through the action of lactate dehydrogenase. Individuals with PKU tend to excrete large quantities of phenylpyruvate, phenylacetate and phenyllactate, along with phenylalanine, in their urine. If untreated, mental retardation effects and microcephaly are evident by the first year along with other symptoms which include: unusual irritability, epileptic seizures and skin lesions. Hyperactivity, EEG abnormalities and seizures, and severe learning disabilities are major clinical problems later in life. A "musty or mousy" odor of skin, hair, sweat and urine (due to phenylacetate accumulation); and a tendency to hypopigmentation and eczema are also observed. The neural-development effects of PKU are primarily due to the disruption of neurotransmitter synthesis. In particular, phenylalanine is a large, neutral amino acid which moves across the blood-brain barrier (BBB) via the large neutral amino acid transporter (LNAAT). Excessive phenylalanine in the blood saturates the transporter. Thus, excessive levels of phenylalanine significantly decrease the levels of other LNAAs in the brain. But since these amino acids are required for protein and neurotransmitter synthesis, phenylalanine accumulation disrupts brain development, leading to mental retardation. (PMID: 10790306; OMIM: 261600). Phenyllactic acid can be found in Acinetobacter, Bacteroides, Bifidobacterium, Clostridium, Enterococcus, Escherichia, Eubacterium, Klebsiella, Lactobacillus, Pseudomonas and Staphylococcus (PMID: 19961416).

Phenyllactic acid is a product of phenylalanine catabolism. An elevated level of phenyllactic acid is found in body fluids of patients with or phenylketonuria.

Tropate, also known as Tropic acid or alpha-(Hydroxymethyl)phenylacetic acid, is classified as a beta hydroxy acid or a Beta hydroxy acid derivative. Beta hydroxy acids are compounds containing a carboxylic acid substituted with a hydroxyl group on the C3 carbon atom. Tropate is considered to be soluble in water and acidic. Tropate can be synthesized from hydratropic acid and propionic acid. Tropate can be synthesized into tropan-3alpha-yl 3-hydroxy-2-phenylpropanoate

4-Hydroxyphenyl-2-propionic acid belongs to the class of organic compounds known as phenylpropanoic acids. Phenylpropanoic acids are compounds with a structure containing a benzene ring conjugated to a propanoic acid. 4-Hydroxyphenyl-2-propionic acid has been detected in multiple biofluids, such as urine and blood (PMID: 20428313). Within the cell, 4-hydroxyphenyl-2-propionic acid is primarily located in the cytoplasm.

Prulaurasin is found in fruits. Prulaurasin is isolated from cherry laurel leaves (Prunus laurocerasus) and other plant

4-Acetamidobenzaldehyde is a member of acetamides and an anilide.

3-Methyldioxyindole is a metabolite of aldehyde dehydrogenase (NAD+) (K00128)(EC 1.2.1.3) formed during 3-methylindole metabolism (PMID: 88251990). It is the major urinary metabolite of 3-methylindole. (PMID: 2519781). It is thought that 3-Methyldioxyindole is an in vivo oxidation product of 3-methylindole which is a metabolic product of tryptophan, produced by bacteria in the colon (PMID: 2796599).

This molecule exists as a tautomer with |FRAME: 4-hydroxy-2-1H-quinolone| and |FRAME: 2-hydroxy-4-1H-quinolone|. The predominance of one tautomeric form over another is determined by pH. This tautomeric form is not predominant in the physiological pH range (reviewed in |CITS: [20738404]|).

(-)-Epiafzelechin is found in fruits. (-)-Epiafzelechin is a constituent of Actinidia chinensis (kiwi fruit) and Juniperus communis (juniper)

Desaminotyrosine, also known as 4-hydroxyphenylpropionic acid, is a normal constituent of human urine. It is a product of tyrosine metabolism; its concentration in urine increases in patients with gastrointestinal diseases. Desaminotyrosine is a major phenolic acid breakdown product of proanthocyanidin metabolism (PMID:15315398). Urinary desaminotyrosine is produced by Clostridium sporogenes and C. botulinum (PMID:29168502). Desaminotyrosine is also found in Acinetobacter, Bacteroides, Bifidobacteria, Bifidobacterium, Clostridium, Enterococcus, Escherichia, Eubacterium, Klebsiella, Lactobacillus, Pseudomonas, and Staphylococcus (PMID:29168502, 28393285, 19961416). Desaminotyrosine is a phenolic acid metabolite formed by the gut microflora detected after the consumption of whole grain.

4-methoxyphenylacetic acid is a monocarboxylic acid that is phenylacetic acid carrying a 4-methoxy substituent. It is used as an intermediate for pharmaceuticals and other organic synthesis. It has been found to inhibit the germination of cress and lettuce seeds. It has a role as a plant metabolite, a plant growth retardant and an Aspergillus metabolite. It is a monocarboxylic acid and a monomethoxybenzene. 4-Methoxyphenylacetic acid, also known as 4-methoxybenzeneacetate or 2-(p-anisyl)acetic acid, belongs to the class of organic compounds known as anisoles. These are organic compounds containing a methoxybenzene or a derivative thereof. 4-Methoxyphenylacetic acid is a 4-O-Methylated catecholamine metabolite found in normal human urine, cerebrospinal fluid and brain tissue.

Scopoletin is found in anise. Scopoletin is isolated from Angelica acutiloba (Dong Dang Gui

5(S),8(R)-DiHODE is a dihydroxy monocarboxylic acid that is the (5S,8R)-dihydroxy derivative of linoleic acid. It is an octadecanoid and a dihydroxy monocarboxylic acid. It is functionally related to a linoleic acid. It is a conjugate acid of a 5(S),8(R)-DiHODE(1-).

(3R,4R)-3-[(1S)-1-Hydroxy-4-methylhexyl]-4-(hydroxymethyl)tetrahydrofuran-2-one has been reported in Streptomyces virginiae with data available.

A tetrahydroxyflavan in which the four hydroxy groups are located at positions 3', 4', 5 and 7." []

(-)-5-oxo-1,2-campholide

B-adrenoceptor antagonist with intrinsic sympathomimetic, for hypertension metabolite of carteolol Dollery, Colin Therapeutic Drugs, 2nd Ed. 1999 p. C72

Robinetinidol

ent-Robinetinidol

ent-Epiafzelechin

2-Hydroxydecanedioic acid appears in the urine of children affected with peroxisomal disorders such as urines of children with neonatal adrenoleukodystrophy and Zellweger syndrome and is a useful marker for these diseases. (PMID 2943344).

5-p-coumaroylquinic acid, also known as trans-5-O-(4-coumaroyl)-D-quinate or P-coumaroyl quinate, belongs to quinic acids and derivatives class of compounds. Those are compounds containing a quinic acid moiety (or a derivative thereof), which is a cyclitol made up of a cyclohexane ring that bears four hydroxyl groups at positions 1,3.4, and 5, as well as a carboxylic acid at position 1. 5-p-coumaroylquinic acid is slightly soluble (in water) and a weakly acidic compound (based on its pKa). 5-p-coumaroylquinic acid can be found in a number of food items such as wild leek, brussel sprouts, ucuhuba, and lemon grass, which makes 5-p-coumaroylquinic acid a potential biomarker for the consumption of these food products.

A cyclopentapyran that is (4aS,7aR)-1,4a,5,6,7,7a-hexahydrocyclopenta[c]pyran substituted at position 1 by a hydroxy group and at positions 4 and 7 by a hydroxymethyl and methyl group, respectively (the 1R,4aS,7S,7aR-diastereomer)." []

A member of the class of hydroxyindoles that is 1H-indole substituted by a hydroxy group at position 4." []