(1R,2S,3R,5S)-3-[6-[2,2-Bis-(4-hydroxy-phenyl)-ethylamino]-2-((R)-3-dimethylamino-pyrrolidin-1-yl)-purin-9-yl]-5-(5-ethyl-tetrazol-2-yl)-cyclopentane-1,2-diol hydrochloride