Expressed by the venom duct. The cysteine framework is III (CC-C-C-CC). Classified in the M-1 branch, since 1 residue stands between the fourth and the fifth cysteine residues. Belongs to the conotoxin M superfamily. Experimental mass obtained by mass spectrometry (2145.0 Da) is very different from the calculated average mass 1817.18, even with consideration of post-translational modifications.