(6S,7S,8R,9S)-7-butyl-8,9-epoxy-1-azaspiro[5.5]undecan-2-one

(2S,1'S)-2-(1'-butylbut-2'-enyl)-6-oxopiperidine-2-carboxylic acid 1-methyl ester

[(4S,2E)-2-octen-4-yl]-4,4,5,5-tetramethyl-1,3,2-dioxaborolane

(6S,7S)-7-butyl-11-hydroxy-1-azaspiro[5.5]undec-8-en-2-one

(6S,7S,8S)-7-butyl-8-hydroxy-1-azaspiro<5.5>undecan-2-one