How is Dimethyl [(methylsulfanyl)methylylidene]biscarbamate (CAS: 34840-23-8) typically synthesized?

Dimethyl [(methylsulfanyl)methylylidene]biscarbamate (CAS: 34840-23-8) is synthesized through a carbamate formation reaction involving methyl isothiocyanate and dimethyl sulfide. The reaction typically requires a suitable solvent and may use an acid catalyst to promote the reaction. The yield is generally good, with the final product being isolated by filtration and purified by recrystallization.