(S)-8-Hydroxy-8-((3aR,6S,6aR)-6-hydroxy-2,2-dimethyl-tetrahydro-furo[2,3-d][1,3]dioxol-5-yl)-octanoic acid ethyl ester

7-((4R,5S,4'R,5'S)-5'-Hydroxymethyl-2,2,2',2'-tetramethyl-[4,4']bi[[1,3]dioxolanyl]-5-yl)-heptanoic acid ethyl ester