3-[(2-hydroxy-1-(R)-phenylethylamino)methyl]-5-methylhexanoic acid
3-[(2-hydroxy-1-(S)-phenylethylamino)methyl]-5-methylhexanoic acid
5-methyl-3-[((R)-1-phenyl-ethylamino)-methyl]-hexanoic acid
3-[(1-(S)-phenylethylamino)-methyl]-5-methyl-hexanoic acid
(R,S)-3-iso-butyl-4-aminobutyric acid