Crassispirid snail peptide that induces sleep-like symptoms in young mice (12 and 14 days) and hyperactivity in older mice (16 days), when intracranially injected. Expressed by the venom duct. The cysteine framework is IX (C-C-C-C-C-C). Contains 3 disulfide bonds. monoisotopic. Has no activity on N-methyl-D-aspartate (NMDA) receptors.