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

(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

(Z)-(+)-crotyldiisopinocampheyl borane

(3S,5S,6S)-6-{(S)-1-[(4S,5S,6S)-6-(2-Benzyloxy-ethyl)-2,2,5-trimethyl-[1,3]dioxan-4-yl]-ethyl}-3-ethyl-5-methyl-tetrahydro-pyran-2-one

Butyric acid (R)-1-{(S)-1-[(4S,5S,6S)-6-(2-benzyloxy-ethyl)-2,2,5-trimethyl-[1,3]dioxan-4-yl]-ethyl}-2-methyl-allyl ester