Pyr-Pro-[13C6;15N]Leu-Pro-Asp-Cys-Cys-Arg-Gln-Lys-Thr-Cys-Ser-Cys-Arg-[13C6;15N]Leu-Tyr-Glu-[13C6;15N]Leu-[13C6;15N]Leu-His-Gly-Ala-Gly-Asn-His-Ala-Ala-Gly-Ile-[13C6;15N]Leu-Thr-[13C6;15N]Leu-NH2 Trifluoroacetate (Disulfide bonds between Cys⁶ and Cys¹²/Cys⁷ and Cys¹⁴)