(Z)-3-(4-chlorophenyl)-2-methylprop-2-enoic acid

tetraethyl butane-1,1,2,3-tetracarboxylate

(2S,3R)-2-Hydroxy-3-methyl-bernsteinsaeuredimethylester

dimethyl (2R)-2-hydroxy-2-methylbutanedioate

N,N,N',N'-tetraethyl-2-methylbut-2-enediamide