diethyl 2-acetamido-2-(methylpyridin-2-yl)malonate
2-amino-4-phenylthiobutanoic acid
acetylamino-(4-methylsulfanyl-benzyl)-malonic acid diethyl ester
acetylamino-[4-(4-nitro-phenoxy)-benzyl]-malonic acid diethyl ester
acetylamino-(2-fluoro-4-methoxy-benzyl)-malonic acid diethyl ester