α-Conotoxin GID is a paralytic peptide neurotoxin that selectively antagonizes nAChR with IC50 values of 5 nM (α7), 3 nM (α3β2), and 150 nM (α4β2). It is a small, disulfide-rich peptide with the potential for chronic pain inhibition. The presence of a C-terminal carboxylate in α-Conotoxin GID is crucial, as its substitution with a C-terminal carboxamide results in a loss of activity against α4β2 nAChR. This compound is derived from species of the genus Conus [1] [2] [3].