H-Ile-Lys-Cys-Asn-Cys-Lys-Arg-His-Val-Ile-Lys-Pro-His-Ile-Cys-Arg-Lys-Ile-Cys-Gly-Lys-Asn-NH2 (Disulfide bonds between Cys³ and Cys¹⁵/Cys⁵ and Cys¹⁹)