[Na].[CH3:2][N:3]1[C:11]2[N:10]=[CH:9][N:8]([CH3:12])[C:7]=2[C:6](=[O:13])[NH:5][C:4]1=[O:14].Cl[CH2:16][CH2:17][CH2:18][P:19](=[O:22])([CH3:21])[CH3:20]>>[CH3:2][N:3]1[C:11]2[N:10]=[CH:9][N:8]([CH3:12])[C:7]=2[C:6](=[O:13])[N:5]([CH2:16][CH2:17][CH2:18][P:19](=[O:22])([CH3:21])[CH3:20])[C:4]1=[O:14]The title substance was prepared from 10.1 g (0.05 mol) of 3,7-di-methylxanthine sodium salt and 3-chloropropyldimethylphosphine oxide analogously to Example 59 and crystallized from ethyl acetate.
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