for the following products
N-(3-Aminopropyl)-N-methyl-carbamic acid 1,1-dimethylethyl ester | N-(3-Aminopropyl)-N-methylcarbamic acid tert-butyl ester | tert-Butyl N-(3-aminopropyl)-N-methylcarbamate and 3-(N-tert-Butoxycarbonyl-N-methylamino)propylamine