Rohm Gmbh

Herbert J Kramer

Klaus Lehmann

Colin Liddiard

Pharmaceutical preparations having diuretic activity and comprising a peptide of the formula ##STR1## wherein (a) R.sub.1 and R.sub.2 are hydrogen and R.sub.3 is --OH, or ##STR2## or Y, or wherein (b) R.sub.1 is hydrogen, R.sub.2 is CH.sub.2 OH or ##STR3## and R.sub.3 is --OH or Y, or wherein (c) R.sub.1 is --CH.sub.2 OH and R.sub.2 is hydrogen or ##STR4## and R.sub.3 is --OH or Y, or wherein (d) R.sub.1 is ##STR5## R.sub.2 is hydrogen or --CH.sub.2 OH and R.sub.3 is --OH, --NHCH.sub.2 COOH, or Y, and

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Bonn, Germany

Herbert J Kramer