Induces a sleep-like state in mice. Expressed by the venom duct. The presence of a 'disulfide through disulfide knot' structurally defines this protein as a knottin. The cysteine framework is VI/VII (C-C-CC-C-C). Equilibrates slowly between two distinct conformers. These two conformational states are clearly interconvertible. Belongs to the conotoxin O2 superfamily.