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Syntheses of 4, 5, 6, 8-tetrahydro-1H, 7H-imidazo[4, 5-d] [1, 3]-diazepine-5, 8-dione (9), its 3-benzyl derivative (8), and 3- and 1-ribosyl derivatives, (12) and (13), respectively, are reported. Single-crystal x-ray analyses of 8 and 9 are also presented.
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Hosmane et al. (1991) studied this question.
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