Asoxime-d4 dichloride (HI-6-d4) is the deuterium labeled Asoxime dichloride. Asoxime dichloride is an orally active thiosemicarbazone-based antidote. Asoxime dichloride is a reversible inhibitor of AChE, and its core mechanism of action is to re-activate AChE inhibited by nerve toxins, thereby restoring the cholinergic nerve function. Asoxime dichloride significantly restores the function of poisoned muscles without reactivating AChE. Asoxime dichloride is an antagonist of acetylcholine receptors (AChRs), including nicotinic receptor and alpha7 nAChR. Asoxime dichloride can serve as an effective immunomodulator, improving the immune effect of the nervous system.