2-Nitro-6,7-dihydro-5H-imidazo[2,1-b][1,3]oxazin-
2-Nitro-6,7-dihydro-5H-imidazo[2,1-b][1,3]oxazin- ??
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2-Nitro-6,7-dihydro-5H-imidazo[2,1-b][1,3]oxazin- C??? ??, ??, ??
2-Nitro-6,7-dihydro-5H-imidazo[2,1-b][1,3]oxazin- ?? ?? ? ???
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2-Nitro-6,7-dihydro-5H-imidazo[2,1-b][1,3]oxazin- ?? ??
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