- 7H-Pyrrolo[2,3-d]pyrimidine-5-methanol, 4-chloro-7-[2-deoxy-3,5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-beta-D-erythro-pentofuranosyl]-2-[[(1,1-dimethylethyl)dimethylsilyl]amino]-,97%, 25mg