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Leucine

Amino acid
Leucine is an essential amino acid that is used in the biosynthesis of proteins. Leucine is an α-amino acid, meaning it contains an α-amino group, an α-carboxylic acid group, and a side chain isobutyl group, making it a non-polar aliphatic amino... Wikipedia
Formula: C6H13NO2
3D model (JSmol): Interactive image; Zwitterion: Interactive image
Acidity (pKa): 2.36 (carboxyl), 9.60 (amino)
Molar mass: 131.175 g·mol−1