(3aR,4aS,5R,7aR,7bR)-7a-(tert-Butyl-dimethyl-silanyloxymethyl)-6-(2,2-dimethyl-propionyloxy)-5-methoxy-2,2-dimethyl-4a,5,7a,7b-tetrahydro-3aH-cyclopenta[4,5]furo[2,3-d][1,3]dioxole-7-carboxylic acid methyl ester