dose-dependent inhibition was also noted with synthetic proteinase substrates , especially those of chymotrypsin-like specificity , phenylalanine and tryptophan methyl esters ( id50s approximately 1.5 x 10 ( -4 ) m ) , as compared to derivatives of basic amino acids , arginine and acetyl-lysine methyl esters , which caused negligible inhibition at 10 ( -3m .
C0301714
basic amino acids
C0003765
arginine