(2S,3R,4S,5S,6R,9S,11S)-2-(2-Benzyloxy-ethyl)-9-ethyl-4-hydroxy-3,5,11-trimethyl-1-oxa-7-aza-spiro[5.5]undecan-8-one

(2S,4S,6S)-6-[(4S,5S,6S)-6-(2-Benzyloxy-ethyl)-2,2,5-trimethyl-[1,3]dioxan-4-yl]-2-ethyl-4-methyl-5-oxo-heptanoic acid amide

(Z)-(+)-crotyldiisopinocampheyl borane