(1R,2S,2'S,3S,4R,6S)-4-acetoxy-1-(2'-benzyloxycarbonylamino-3'-tert-butyldiphenylsilyloxy-propyl)-2,3-epoxy-6-hydroxy-2-cyclohexen-1-ol

(1S,4R,4'S,4aS,5S,6S,8aR)-4'-benzyloxycarbonylamino-6-triethylsilyloxy-1,3',4',4,4a,6,7,8a-octahydrospiro[furan-2'(5H),5(8H)-1,4-methanonaphthalene]-5',8-dione