3β,4β,5α,6β,27-pentahydroxy-1-oxo-with-24-enolide

[Ala1,3,11,15]-Endothelin (TFA) is a highly selective for endothelin A (ETA) and endothelin B (ETB) receptor.[Ala1,?3,?11,?15]?-?Endothelin is a selective ETB endothelin receptor agonist (IC50 values are 0.33 and 2200 nM for displacing [125I]-ET-1 from ETB and ETA receptors respectively).

SPACE peptide is a skin penetrating peptide that facilitates the transfer of molecules through the skin.