Antibiotically active tripeptides of the sequence L-arg-D-X-L-phe] (author's transl)]

Five tripeptides with the sequence L-Arg-D-X-L-Phe showed antibiotic activity on fungi and on some pathogenic moulds. The action of the peptides could be neutralized in the cross-strip test by the L-amino acid corresponding to the D-amino acid in the middle position.