1,3,7-Trioxaspiro[4.4]nonan-9-ol, 8-[6-chloro-4-[(3aR,6aS)-hexahydrocyclopenta[c]pyrrol-2(1H)-yl]-1H-pyrazolo[3,4-b]pyridin-1-yl]-6-[[[(1,1-dimethylethyl)dimethylsilyl]oxy]methyl]-2,2-dimethyl-, 9-acetate, (6R,8R,9R)-