(3'R,4'R)-4'-(6-chloropurin-9-yl)-3'-hydroxy-1'-hydroxymethyl-cyclopent-1'-ene

(1R,2S,3R,4S)-2,3-isopropylidenedioxy-4-(1'-methoxycarbonyl-1'-oxomethyl)cyclopentane-1-carboxylic acid

dimethyl (3aR,4R,7R,7aS)-2,2-dimethyl-3a,4,7,7a-tetrahydro-4,7-methanobenzo[d][1,3]dioxole-5,6-dicarboxylate

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