Halogen atoms or nitro radicals

Full Title

Heterocyclic compounds containing 1,2-diazine or hydrogenated 1,2-diazine rings > not condensed with other rings > having three double bonds between ring members or between ring members and non-ring members > with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms > Halogen atoms or nitro radicals