(3'R,4'S,5'R)-3'-(6-chloropurin-9-yl)-4',5'-O-isopropylidene-1'-pivaloyloxymethyl-cyclopent-1'-en-4',5'-diol

(1'R,2'R,3'S,4'R)-4'-(6-chloropurin-9-yl)-2',3'-O-isopropylidene-1'-pivaloyloxymethyl-cyclopentane-1',2',3'-triol

(1'R,4'S)-1'-(6-chloropurin-9-yl)-4'-phenylsulfonyl(nitro)methyl-cyclopent-2'-ene

(1'R,2'R,3'S,4'S)-1'-(6-chloropurin-9-yl)-2',3'-epoxy-4'-phenylsulfonyl(nitro)methyl-cyclopentane

(3'R,4'R)-4'-(6-chloropurin-9-yl)-1'-methoxycarbonyl-3'-(p-nitrobenzoyl)oxy-cyclopent-1'-ene