1-(2-Chloroethyl)-1-methylaziridinium 1-Methyl-1-(beta-chloroethyl)ethylenimonium 36375-20-9 57-54-5 AZIRIDINIUM, 1-(2-CHLOROETHYL)-1-METHYL- BRN 3535924 Chlorimine mustard N-2-Chloroethyl-N-methylaziridinium