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