6-(4-Chlorophenylsulphonyl)-9-(2,3-O-Cyclopentylidene-Ss-D-Ribofuranosyl)-9H-Purine

6-(4-Chlorophenylsulphonyl)-9-(2,3-O-Cyclopentylidene-Ss-D-Ribofuranosyl)-9H-Purine ·