4-(6c-methoxy-4ξ,7-dioxo-4λ4-thia-1-aza-bicyclo[3.2.0]hept-5r-yl)-benzoic acid benzyl ester

4-(7-oxo-6c-phenoxy-4-thia-1-aza-bicyclo[3.2.0]hept-5r-yl)-benzoic acid benzyl ester

9-((2R,3R,4S,5S)-3,4-bis(benzyloxy)-5-(chloromethyl)tetrahydrofuran-2-yl)-9H-purin-6-amine