Thiocarbonic acid O-{(2S,3aR,4S)-2-[(R)-4-(tert-butyl-dimethyl-silanyloxy)-pentyl]-hexahydro-pyrrolo[1,2-b]isoxazol-4-yl} ester O-phenyl ester

(2S,2''S,3aS,5'S,6S,6''R)-2-[5'S-(tert-butyl-dimethylsilyloxy)-(Z)-3'-heptenyl]-6-[6''-(tert-butyl-dimethylsilyloxy)-2''hydroxypentyl]-hexahydropyrrolo[1,2-b]isoxazole