dimethyl 2,2-dicyano-3-ethoxycyclobutane-1,1-dicarboxylate

dimethyl 2-hydroxy-2-(3-methyl-2-methylenebutyl)malonate

dimethyl 2-(2,3-dimethylbut-2-enyl)-2-hydroxypropanedioate

dimethyl 2-hydroxy-2-[(5-methylfuran-2-yl)methyl]propanedioate

dimethyl 2-[acetyl(phenyl)hydrazinylidene]propanedioate