| abstract |
[(2R, 3S, 4R, 5R) -5- (6- (cyclopentylamino) -9H-purin-9-yl) -3,4-dihydroxytetrahydrofuran-2-yl] methyl nitrate (compound) A crystalline anhydrous polymorph of A) and a process for producing the same. A crystalline anhydrous polymorph A1 of Compound A obtained by recrystallizing Compound A from isopropanol, ethyl acetate or isopropyl acetate and showing the following crystal data. C15H20N6O6; Mr = 380.37; monoclinic system; P21 space group; a = 5.546 (2) Å; b = 7.107 (2) Å; c = 21.929 (9) Å; V = 858 .8 (5) Å3 and Z = 2 [Selection figure] None |