Asoxime-d 4 (dichloride) is the deuterium labeled Asoxime dichloride. Asoxime dichloride (HI-6) is an antagonist to acetylcholine receptors (AChRs) including the nicotinic receptor, α7 nAChR. Asoxime dichloride involves in modulating immunity response. Asoxime dichloride (HI-6) can be used as an antigen and improves vaccination efficacy in the nervous system.