Syntheses of tetra‐ and pentapeptides from skin extracts of Phyllomedusa rhodei (tryptophyllins)*

Abstract
Syntheses by solution methods of tryptophyllins ‐4 and ‐5 (TPH‐4 and TPH‐5), tetra‐ and pentapeptides isolated from the skin extracts of the South American frog Phyllomedusa rhodei, are reported. The incorporation of the Pro2‐Pro3 sequence into pentapeptides and the use of flash chromatography for purification of intermediates and target compounds are discussed. Preliminary biological results seem to indicate a growth‐promoting activity for this peptide family.