Butylimino-diessigsaeure-diaethylester

ethyl 2-(2-hydroxyethylsulfanyl)acetate

diethyl 2-butylsulfanylbutanedioate

ethyl 2-(3-nitroanilino)acetate

N,N-bis(2-ethoxy-2-oxo-1-ethyl)-3-nitrophenylamine