Causes hyperactivity, circular motion, convulsion, urination and death, when injected into 13- to 15-day-old mice. Causes gasping, backward swimming or swimming in a vertical direction and death, when intraperitoneally injected into goldfish. Expressed by the venom duct. The cysteine framework is XI (C-C-CC-CC-C-C). Belongs to the conotoxin I1 superfamily.