(2S,4R,7R,8R,9S,11S)-1-Azido-8-(tert-butyl-dimethyl-silanyloxy)-7-hydroxy-9-(4-methoxy-benzyloxy)-2,4,11-trimethyl-14-triethylsilanyl-tetradec-13-yn-5-one

(2S,3S,5R,8S,10R)-3-(tert-Butyl-dimethyl-silanyloxy)-2-[(1S,3S)-1-(4-methoxy-benzyloxy)-3-methyl-hex-5-ynyl]-8,10-dimethyl-1-oxa-6-aza-spiro[4.5]decane-6-carboxylic acid tert-butyl ester

(2S,3S,5R,8S,10R)-3-Benzoyloxy-2-[(1S,3S)-1-(4-methoxy-benzyloxy)-3-methyl-hex-5-ynyl]-8,10-dimethyl-1-oxa-6-aza-spiro[4.5]decane-6-carboxylic acid tert-butyl ester