furethidine

4-phenyl-1-[2-(tetrahydrofurfuryloxy)ethyl]isonipecot ethyl ester

ethyl 1-[2-(oxolan-2-ylmethoxy)ethyl]-4-phenylpiperidine-4-carboxylate

ethyl 1-[2-(oxolan-2-ylmethoxy)ethyl]-4-phenyl-piperidine-4-carboxylate

4-Phenyl-1-[2-[(tetrahydrofuran-2-yl)methoxy]ethyl]-4-piperidinecarboxylic acid ethyl ester