Conotoxin is a cocktail-like mixed toxin secreted by the venom tube of the marine gastropod mollusk Conus and the venom gland on the inner wall of the venom sac. It is a cocktail-like mixed toxin composed of many single toxic peptides. Active peptide compounds with high specificity for ion channels and neuroreceptors. Each Cono snail venom may contain 50 to 200 active peptides. u-Conotoxin GIIIA is a peptide composed of 22 amino acids. The sequence contains Hyp and three pairs of disulfide bonds, and the secondary structure is very stable.