only one phase - n-tfa-l-chi-amino-n-butyryl-l-chi-amino butyric acid cyclohexyl ester - gave complete resolution of the naturally occurring amino acids alanine , valine , glycine , threonine , leucine , isoleucine , serine and proline on a 400 ft x 0.02 in capillary column .
C0002520
amino acids
C0001898
alanine