It is the principal representative of the nitrogen mustards because its vesicant properties are almost equal to those of HD and thus the analogy between the two types of mustard is the strongest. As a vesicant the use and production is strongly restricted within the Chemical Weapons Convention where it is classified as a Schedule 1 substance.
It serves as the leading representative for nitrogen mustards because its vesicant effects are almost identical to those of HD, making this comparison particularly strong. As a vesicant, its use and production are severely limited under the Chemical Weapons Convention, placing it in the highest-risk category (Schedule 1).