SUBSTITUTED 4-AMINO-3-HYDROXYBUTYRIC ACID DERIVATIVE AND MANUFACTURE

摘要

Compounds of the formula in which R<1> is absent or is hydrogen, alkyl or acyl, A is a carboxylic acid residue or an amino acid residue, B is an optionally N-alkylated amino acid residue, R<2> is hydrogen, alkyl, alkylcycloalkyl, aryl-lower alkyl or aryl, R<3> is hydrogen, alkyl or alkyl-lower alkyl and R<4> is substituted amino, and the salts thereof are used in pharmaceutical products.