(2S,3R)-3-(tert-butyl-dimethyl-silanyloxy)-2-methyl-4-{2-[(2S,3S,6R)-3-methyl-6-((E)-2-oxopent-3-enyl)tetrahydro-pyran-2-yl]-acetylamino}-butyric acid

(2S,3R)-3-(tert-butyl-dimethyl-silanyloxy)-2-methyl-4-{2-[(2S,3S,6R)-3-methyl-6-((E)-2-oxopent-3-enyl)tetrahydro-pyran-2-yl]-acetylamino}-butyric acid triisopropylsilyl ester

3-(tert-butyl-dimethyl-silanyloxy)-N-(3-{8-[6-(tert-butyl-dimethyl-silanyloxy)-3,5-dimethyl-hept-4-enyl]-3-methyl-1,7-dioxa-spiro[5.5]undec-2-yl}-propyl)-2-methyl-4-{2-[3-methyl-6-(2-oxopent-3-enyl)tetrahydro-pyran-2-yl]-acetylamino}-butyramide

(2S,3R)-4-Azido-3-hydroxy-2-methyl-butyric acid