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The leucines are primarily the four isomeric amino acids: leucine, isoleucine, tert-leucine and norleucine. Being compared with the four butanols, they could be classified as butyl-substituted glycines; they represent all four possible variations.
Contents
Leucine and isoleucine belong to the proteinogenic amino acids; the others are non-natural.
Isomers
Including the stereoisomers, six further isomers could be added: D-leucine, D-isoleucine, L-allo-isoleucine, D-allo-isoleucine, D-tert-leucine and D-norleucine.
Derivatives
Cycloleucine could be classified as a cyclic derivative of norleucine. With a cyclopentane-ring, it has two hydrogen atoms fewer and thus is not an isomer. The α-carbon atom is not a stereocenter.
References
Leucines Wikipedia(Text) CC BY-SA