tert-butyl 4-(2-ethoxy-2-oxoethylidene)tetrahydro-1(2H)-pyridinecarboxylate;
ethyl [1-(tert-butoxycarbonyl)piperidin-4-ylidene]acetate;
tert-butyl 4-(ethoxycarbonylmethylene)piperidine-1-carboxylate;
tert-butyl 4-(2-ethoxy-2-oxoethylidene)-1-piperidinecarboxylate;
1-tert-butoxycarbonyl-4-ethoxycarbonylmethylenepiperidine;
(1-tert-butoxycarbonylpiperidin-4-ylidene)acetic acid ethyl ester;
t-butyl 4-(2-ethoxy-2-oxoethylidene)tetrahydropyridine-1(2H)-carboxylate;
4-Ethoxycarbonylmethylenepiperidine-1-carboxylic acid tert-butyl ester;
4-(2-Ethoxy-2-oxoethylidene)-1-piperidinecarboxylic acid tert-butyl ester;