4,9-diazabicyclo[4.3.0]nona-2,7,10-trien-5-one
4,9-diazabicyclo[4.3.0]nona-2,7,10-trien-5-one ??
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4,9-diazabicyclo[4.3.0]nona-2,7,10-trien-5-one ?? ?? ? ???
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4,9-diazabicyclo[4.3.0]nona-2,7,10-trien-5-one ?? ??
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