(7R,8S)-7-((R)-1-phenyl-ethylamino)-1,4-dioxa-spiro[4.5]decane-8-carboxylic acid ethyl ester

ethyl 7-oxo-1,4-dioxaspiro[4.5]decane-8-carboxylate

7-((R)-1-phenyl-ethylamino)-1,4-dioxa-spiro[4.5]dec-7-ene-8-carboxylic acid ethyl ester

benzyl ((1R,2S)-2-(((3-(4-fluorophenyl)propyl)(methyl)amino)methyl)-5-oxocyclohexyl)carbamate

benzyl ((1R,2S)-2-(((3-(4-fluorophenyl)propyl)(methyl)amino)methyl)-5-(methylamino)cyclohexyl)carbamate