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4-(trimethylammonio)but-2-enoate is an amino-acid betaine. It is functionally related to a but-2-enoate. It is a conjugate base of a 4-(trimethylammonio)but-2-enoic acid. Crotonobetaine is a metabolite found in or produced by Escherichia coli (strain K12, MG1655).

An amino acid betaine that is D-proline zwitterion in which both of the hydrogens attached to the nitrogen are replaced by methyl groups." []

Proline betaine is an osmoprotective compound found in urine. It is thought to serve an osmoprotective role for the kidney. Proline betaine is a glycine betaine analogue found in many citrus foods. Elevated levels of proline betaine in human urine are found after the consumption of citrus fruits and juices (PMID: 18060588). Proline betaine is a biomarker for the consumption of citrus fruits.

L-2-Amino-3-methylenehexanoic acid is found in mushrooms. L-2-Amino-3-methylenehexanoic acid is found in carpophores of Amanita vaginata (grisette

(3S,6R)-8-Azabicyclo[3.2.1]octane-3,6-diol is found in fruits. (3S,6R)-8-Azabicyclo[3.2.1]octane-3,6-diol is an alkaloid from the fruit of Morus alba (white mulberry).

1-amino-1-cyclohexanecarboxylic acid is an alpha-amino acid that is cyclohexanecarboxylic acid substituted by an amino group at position 1. It is functionally related to a cyclohexanecarboxylic acid.

See also: Mureletecan (monomer of).

An amino acid betaine that is D-proline zwitterion in which both of the hydrogens attached to the nitrogen are replaced by methyl groups." []