[CH2:1]([N:8]1[C:16]2[C:15](=[O:17])[NH:14][C:13](=[O:18])[N:12]([CH3:19])[C:11]=2[N:10]=[CH:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.Br[CH2:21][CH2:22][CH2:23][CH2:24][CH2:25][P:26]([O:31][CH2:32][CH3:33])(=[O:30])[O:27][CH2:28][CH3:29]>>[CH2:1]([N:8]1[C:16]2[C:15](=[O:17])[N:14]([CH2:21][CH2:22][CH2:23][CH2:24][CH2:25][P:26](=[O:30])([O:31][CH2:32][CH3:33])[O:27][CH2:28][CH3:29])[C:13](=[O:18])[N:12]([CH3:19])[C:11]=2[N:10]=[CH:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1The title compound was prepared from 7-benzyl-3-methylxanthine (0.059 mol) and diethyl 5-bromopentanephosphonate (0.07 mol) analogously to Example 23.
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