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2,2-Dimethyl-propionic acid (5R,6R,7S,8S)-8-(tert-butyl-dimethyl-silanyloxy)-5-[4-(tert-butyl-dimethyl-silanyloxy)-3,5-dimethoxy-phenyl]-7-formyl-5,6,7,8-tetrahydro-naphtho[2,3-d][1,3]dioxol-6-ylmethyl ester
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(5S,6S,7R,8R)-5-(tert-Butyl-dimethyl-silanyloxy)-8-[4-(tert-butyl-dimethyl-silanyloxy)-3,5-dimethoxy-phenyl]-7-(2,2-dimethyl-propionyloxymethyl)-5,6,7,8-tetrahydro-naphtho[2,3-d][1,3]dioxole-6-carboxylic acid