4-chloro-7-(2,3-dideoxy-5-O-((1,1-dimethylethyl)dimethylsilyl)-α-D-glycero-pentofuranosyl)-7H-pyrrolo(2,3-d)pyrimidine

4-chloro-7-[2,3-dideoxy-5-O-[(1,1-dimethylethyl)dimethylsilyl]-β-D-glycero-pentofuranosyl]-7H-pyrrolo[2,3-d]pyrimidine