p-menthane-8,9-dioic acid diethyl ester

(1-oxo-1,2,3,4-tetrahydro-[2]phenanthryl)-acetic acid

diethyl cycloheptane-1,1-dicarboxylate

diethyl β-anilinobenzylidenemalonate

1,1,4-butanetricarboxylic acid triethyl ester