(2R,3S)-4-[(2R,4S,5S,6S)-6-(1,1-Dimethyl-2-oxo-ethyl)-4,6-dimethoxy-5-triethylsilanyloxy-tetrahydro-pyran-2-yl]-3-methoxy-2-methoxymethoxy-butyric acid methyl ester

(2R,3S)-4-[(2R,4S,5S,6S)-6-(2-Hydroxy-1,1-dimethyl-ethyl)-4,6-dimethoxy-5-triethylsilanyloxy-tetrahydro-pyran-2-yl]-3-methoxy-2-methoxymethoxy-butyric acid methyl ester

(2R,3S)-3-Methoxy-4-[(2R,4R,6R,8R,10S,11S)-10-methoxy-5,5-dimethyl-2-naphthalen-2-yl-4-(2-oxo-ethyl)-11-triethylsilanyloxy-1,3,7-trioxa-spiro[5.5]undec-8-yl]-2-methoxymethoxy-butyric acid methyl ester