H-Cys-Ser-Cys-Ser-Ser-Leu-Met-Asp-Lys-Glu-Cys-Val-Tyr-Phe-Cys-His-Leu-Asp-Ile-Ile-Trp-OH Trifluoroacetate (Disulfide bonds between Cys¹ and Cys¹⁵/Cys³ and Cys¹¹)