Ethylcholine mustard is a neurotoxic nitrogen mustard that destroys cholinergic neurons.

[2][3] It's the hydrolysis product of the HN1 vesicant.

[1] Under aqueous condition, ethylcholine mustard forms the highly reactive ethylcholine aziridinium (AF64A) ion.

AF64A can also produce cytotoxic effects, leading to cell death.

[2][3] The aziridinium ion can be isolated as picrylsulfonate salt.