Voltage-gated calcium channel inhibitor (Cav) (8.6% block at 10 nM), when tested on DRG neurons. Expressed by the venom gland. Has the structural arrangement of an alpha-helix connected to a beta-sheet by disulfide bonds (CSalpha/beta). Since the toxin contains only 2 disulfide bonds, it is called 2ds-CSalpha/beta. Contains 2 disulfide bonds. Belongs to the scoloptoxin-15 family.