Pyr-Pro-Leu-Pro-Asp-Cys-Cys-Arg-Gln-Lys-Thr-Cys-Ser-Cys-Arg-OH Trifluoroacetate (Disulfide bonds between Cys⁶ and Cys¹²/Cys⁷ and Cys¹⁴)