p. 3507 - 3511
(1990)N-carbobenzyloxy-O-carbobenzyloxy-L-tyrosylglycylglycyl-L-phenylalanine 4-(methylsulfonyl)phenyl ester
N-carbobenzyloxy-O-carbobenzyloxy-L-tyrosylglycylglycyl-L-phenylalanine 4-(methylthio)phenyl ester
N-tert-butyloxycarbonylglycyl-L-phenylalanyl-L-leucine p-nitroanilide
N-tert-butyloxycarbonylglycyl-L-phenylalanine 4-(methylsulfonyl)phenyl ester
N-tert-butyloxycarbonylglycyl-L-phenylalanine 4-(methylthio)phenylester