(4R,5S)-(E)-5-(t-butyl(dimethyl)silyloxy)-4-(β-methoxyethoxy)methoxy-2-hexenoic acid

(1S,2R)-2-tert-butyldiphenylsilyloxy-1-methyl-3-butenyl (2E,4R,5S)-5-tert-butyldimethylsilyloxy-4-(2-methoxyethoxy)methoxy-2-hexenoate

(1S,2R,3E)-4-[(1S,2R)-2-tert-butyldiphenylsilyloxy-1-methyl-3-butenyloxy]-2-(methoxyethoxy)methoxy-1-methyl-3-butenyl (S)-3-tert-butoxycarbonylamino-butenoate

ethyl (2E,4S,5S)-4,5-dihydroxy-2-hexenoate