for the following products
6-(Benzyloxy)-9-(1S,3R,3S)-4-(benzyloxy)-3-(benzyoxymethyl)-2-methylenecyclopentyl)-N-((4-methyoxyphenyl)diphenylmethyl)-9H-purin-2-amine) | 9H-purin-2-amine, N-[(4-methoxyphenyl)diphenylmethyl]-9-[2-methylene-4-(phenylmethoxy)-3-[(phenylmethoxy)methyl]cyclopentyl]-6-(phenylmethoxy)-[1s-( and Entecavir intermediate 7
