(1S,5S,6S,7R)-3-(2-hydroxyethyl)-6-[3(S)-(tetrahydropyran-2-yl)oxy-1(E)-octenyl]-7-(tetrahydropyran-2-yl)oxybicyclo[3.3.0]oct-2-ene

(3aS,4S,5R,6aR)-5-Hydroxy-4-trityloxymethyl-hexahydro-pentalen-2-one