A liquid membrane containing the ethoxycarbonylmethyl derivative 1 of p-tert-butylcalix[6]arene exhibited pronounced transport selectivity towards ethyl esters of both phenylalanine and tryptophan over glycine, alanine and 4-aminobutyric acid (GABA).
S. Chang, H. Hwang, H. Son, J. Youk and Y. S. Kang, J. Chem. Soc., Chem. Commun., 1991, 217 DOI: 10.1039/C39910000217
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