Cl(O)(=O)(=O)=O.[CH3:6][N:7]1[C:16](=[O:17])[C:15]2[N:14]([CH2:18][CH2:19][CH2:20][CH2:21][CH:22]3[O:24][CH2:23]3)[CH:13]=[N:12][C:11]=2[N:10]([CH3:25])[C:8]1=[O:9].C[O:27]CCOC.C(=O)(O)[O-].[Na+]>O>[CH3:6][N:7]1[C:16](=[O:17])[C:15]2[N:14]([CH2:18][CH2:19][CH2:20][CH2:21][CH:22]([OH:24])[CH2:23][OH:27])[CH:13]=[N:12][C:11]=2[N:10]([CH3:25])[C:8]1=[O:9]0.24 ml of perchloric acid (70% strength) was added dropwise with stirring in 5 minutes to a solution of 3.6 g of 1,3-dimethyl-7-(5,6-epoxyhexyl)xanthine in 280 ml of a mixture of ethylene glycol dimethyl ether and water (volume ratio 3:2) at room temperature. After stirring at room temperature for 16 hours, the mixture was neutralized with sodium bicarbonate solution and evaporated under reduced pressure. The residue was purified by column chromatography on silica gel (mobile phase: chloroform/ethanol, volume ratio 8/2) and recrystallization from ethyl acetate.
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