73664-84-3 BENZAMIDINE, N,N'-BIS(L-CARBOXYISOBUTYLMETHYL)- L-Leucine, N-(((1-carboxy-3-methylbutyl)amino)phenylmethylene)-, (S)- (9CI) N,N'-Bis(L-carboxyisobutylmethyl)benzamidine NSC 225221