O-tert-butyl-L-tyrosyl-L-glutaminyl-L-leucine methyl ester
N-<1-(4-biphenylyl)-1-methylethoxycarbonyl>-L-leucyl-O-tert-butyl-L-tyrosyl-L-glutaminyl-L-leucine methyl ester
N-Z-O-tert-butyl-L-tyrosyl-L-glutaminyl-L-leucine methyl ester
methyl ester of N-benzyloxycarbonylglutaminyl-β-O-tert-butylasparaginylphenylalanine
N-α-Z-L-glutaminyl-L-leucine methyl ester