for the following products
1-Methylamino-1-methylmercapto-2-nitroethene | 1-Methylamino-1-methylthio-2-nitroethene | 1-Methylthio-1-methylamino-2-nitroethylene | N-Methyl-1-(methylthio)-2-nitroethenamine and 1-Methylamino-1-methylthio-2-nitroethylene