H-Arg-Asp-Hyp-Cys-Cys-Tyr-His-Pro-Thr-Cys-Asn-Met-Ser-Asn-Pro-Gln-Ile-Cys-OH Trifluoroacetate (Disulfide bonds between Cys⁴ and Cys¹⁰/Cys⁵ and Cys¹⁸)