Abstract:
            Amides of L-aspartyl-D-amino acid dipeptides of the formula ##STR1## and physiologically acceptable cationic and acid addition salts thereof wherein R. sup. a is methyl, ethyl, n-propyl or isopropyl; R is a branched member selected from the group consisting of fenchyl, diisopropylcarbinyl, d-methyl-t-butylcarbinyl, d-ethyl-t-butylcarbinyl, di-t-butylcarbinyl, 2-methylthio-2,4-dimethylpentan-3-yl, ##STR2## where at least one of R. sup. 3, R. sup. 4, R. sup. 5, R. sup. 6 is alkyl having from one to four carbon atoms and the remainder are hydrogen or alkyl having from one to four carbon atoms, X is O, S, SO, SO. sub. 2, C. dbd. O or CHOH; m is zero or 1-4, n and p are each zero, 1, 2 or 3 where the sum of n+p is not greater than 3 and the sum of the carbon atoms in R. sup. 3, R. sup. 4, R. sup. 5 and R. sup. 6 is not greater than six, and when both of R. sup. 3 and R. sup. 4 or R. sup. 5 and R. sup. 6 are alkyl they are methyl or ethyl, ##STR3## where one of R. sup. 7, R. sup. 8, R. sup.