9-[6-({[tert-butyl(dimethyl)silyl]oxy}methyl)-2,2-dimethyltetrahydro-3aH-cyclopenta[d][1,3]dioxol-4-yl]-6-chloro-9H-purine 9H-purine, 6-chloro-9-[6-[[[(1,1-dimethylethyl)dimethylsilyl]oxy]methyl]tetrahydro-2,2-dimethyl-4H-cyclopenta[d]-1,3-dioxol-4-yl]- InChI=1/C20H31ClN4O3Si/c1-19(2,3)29(6,7)26-9-12-8-13(16-15(12)27-20(4,5)28-16)25-11-24-14-17(21)22-10-23-18(14)25/h10-13,15-16H,8-9H2,1-7H