for the following products
6-(Benzyloxy)-9-((1S,3R,4S)-4-(benzyloxy)-3-(benzyloxymethyl)-2-methylenecyclopentyl)-9H-purin-2-amine | 9-[(1S, 3R, 4S)-2-methylene-4-(phenylmethoxy)-3-[(phenylmethoxy)methyl]cyclopentyl]-6-(phenylmethoxy)-9H-purine-2-amine and 6-Benzyloxy-9-[(1S,3R,4S)-2-methylene-4-benzyloxy-3-benzyloxy methylcyclopentyl]-9H-purine-2-amine
