(S)-4-Amino-6-bromo-7-((3R,4S,5R)-3,4-dihydroxy-5-hydroxymethyl-tetrah ydro-furan-2-yl)-7,7a-dihydro-4aH-pyrrolo[2,3-d]pyrimidine-5-carbonitr ile [ 20201-55-2 ]