1-isocyanato-2-(2-isocyanatoethyldisulfanyl)ethane

1-(2-chloroethyl)-3-(2-tritylsulfanylethyl)urea

di-trichloro-2,4,5 phenoxycarbonyl N,N'-cystamine

bis N,N'-(N-chloro-2 ethylcarbamoyl)cystamine