(1'S,2'R,3'S,4'R)-1'-acetyloxymethyl-4'-(6-chloropurin-9-yl)-2',3'-diacetyloxy-1'-hydroxycyclopent-1'-ene

(1R,2S,3R)-4-[(methoxymethyl)oxymethyl]-2,3-[(dimethylmethylene)dioxy]-4-cyclopenten-1-amine

methyl (1R,2S,3R,4R)-2,3-[(dimethylmethylene)dioxy]-4-formyl-cyclopentane-1-carboxylate

(3R,4R,5S,6R)-4,5-[(dimethylmethylene)dioxy]-6-[(methoxycarbonyl)amino]-1-oxospiro[2.4]heptane

(1R,2S,3R)-4-(chloromethyl)-1-[(methoxycarbonyl)amino]2,3-[(dimethylmethylene)dioxy]-4-cyclopentene