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2,3,4,5-Tetrahydro-2-pyridinecarboxylic acid (CAS: 3038-89-9), also known as 2,3,4,5-tetrahydropiperidine-2-carboxylate and 1-piperideine-6-carboxylic acid, is a cyclic intermediate in lysine degradation. L-Lysine is an essential amino acid that is a necessary building block for all protein in the body and It plays a major role in calcium absorption; building muscle protein; recovering from surgery or sports injuries; and the body's production of hormones, enzymes, and antibodies. In the lysine degradation pathway, 2,3,4,5-tetrahydro-2-pyridinecarboxylic acid is a substrate for L-aminoadipate-semialdehyde dehydrogenase (amaA) and can be formed by the spontaneous cyclization of 2-aminoadipate-6-semialdehyde. 2,3,4,5-Tetrahydro-2-pyridinecarboxylic acid is also an intermediate in glycine, serine, and threonine metabolism. It is a substrate for peroxisomal sarcosine oxidase.

CPD-9757 is an alpha-amino acid. 2-Amino-2-(2-methylenecyclopropyl)acetic acid is a natural product found in Litchi chinensis with data available.

1-Piperideine-2-carboxylic acid (P2C), also known as Δ1-pipecolic acid, is classified as a member of the tetrahydropyridines. Tetrahydropyridines are derivatives of pyridine in which two double bonds in the pyridine moiety are reduced by adding four hydrogen atoms. 1-Piperideine-2-carboxylic acid is considered to be slightly soluble (in water) and acidic. 1-Piperideine-2-carboxylic acid is an intermediate of the L-lysine metabolic pathway in the brain; the uptake of P2C into the synaptosome of the cerebral cortex was Na+ and temperature-dependent (PMID: 7654748).

A alpha,beta-unsaturated monocarboxylic acid that is nicotinic acid which has been hydrogenated at the 1-2 and 5-6 positions of the pyridine ring." []

Isoguvacine is a tetrahydropyridine.

(±)-4-Methylene-2-pyrrolidinecarboxylic acid is found in fruits. (±)-4-Methylene-2-pyrrolidinecarboxylic acid is present in loquat seeds (Eriobotrya japonica

Baikiain, also known as 4,5-dehydropipecolic acid, (+-)-isomer, is a member of the class of compounds known as alpha amino acids. Alpha amino acids are amino acids in which the amino group is attached to the carbon atom immediately adjacent to the carboxylate group (alpha carbon). Baikiain is soluble (in water) and a moderately acidic compound (based on its pKa). Baikiain can be found in date, which makes baikiain a potential biomarker for the consumption of this food product.

N-ethylsuccinimide is a pyrrolidinone and a dicarboximide. N-Ethylsuccinimide is a metabolite found in or produced by Escherichia coli (strain K12, MG1655).

An L-alpha-amino acid residue derived from L-allysine." []

A non-proteinogenic L-alpha-amino acid that is glycine in which one of the methyl hydrogens has been replaced by a 2-methylenecyclopropyl group." []

A pyrroline consisting of 2-pyrroline having methyl and carboxy substituents at positions 4 and 5 respectively." []