... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > pnictogen molecular entity > nitrogen molecular entity > organonitrogen compound > organonitrogen heterocyclic compound > pyrimidopyrimidine

... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > carbon group molecular entity > organic molecular entity > heteroorganic entity > organonitrogen compound > organonitrogen heterocyclic compound > pyrimidopyrimidine

... > chemical entity > molecular entity > polyatomic entity > molecule > cyclic compound > heterocyclic compound > organic heterocyclic compound > organonitrogen heterocyclic compound > pyrimidopyrimidine

... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > carbon group molecular entity > organic molecular entity > organic molecule > organic cyclic compound > organic heterocyclic compound > organonitrogen heterocyclic compound > pyrimidopyrimidine

... > chemical entity > molecular entity > polyatomic entity > molecule > organic molecule > organic cyclic compound > organic heterocyclic compound > organonitrogen heterocyclic compound > pyrimidopyrimidine

... > chemical entity > molecular entity > polyatomic entity > molecule > cyclic compound > organic cyclic compound > organic heterocyclic compound > organonitrogen heterocyclic compound > pyrimidopyrimidine

... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > carbon group molecular entity > organic molecular entity > heteroorganic entity > organic heterocyclic compound > organonitrogen heterocyclic compound > pyrimidopyrimidine

... > chemical entity > molecular entity > polyatomic entity > molecule > cyclic compound > heterocyclic compound > organic heterocyclic compound > organic heteropolycyclic compound > organic heterobicyclic compound > pyrimidopyrimidine

... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > carbon group molecular entity > organic molecular entity > organic molecule > organic cyclic compound > organic heterocyclic compound > organic heteropolycyclic compound > organic heterobicyclic compound > pyrimidopyrimidine

... > chemical entity > molecular entity > polyatomic entity > molecule > organic molecule > organic cyclic compound > organic heterocyclic compound > organic heteropolycyclic compound > organic heterobicyclic compound > pyrimidopyrimidine

... > chemical entity > molecular entity > polyatomic entity > molecule > cyclic compound > organic cyclic compound > organic heterocyclic compound > organic heteropolycyclic compound > organic heterobicyclic compound > pyrimidopyrimidine

... > chemical entity > molecular entity > main group molecular entity > p-block molecular entity > carbon group molecular entity > organic molecular entity > heteroorganic entity > organic heterocyclic compound > organic heteropolycyclic compound > organic heterobicyclic compound > pyrimidopyrimidine

... > chemical entity > molecular entity > polyatomic entity > molecule > cyclic compound > heterocyclic compound > heteropolycyclic compound > organic heteropolycyclic compound > organic heterobicyclic compound > pyrimidopyrimidine

... > chemical entity > molecular entity > polyatomic entity > molecule > cyclic compound > polycyclic compound > heteropolycyclic compound > organic heteropolycyclic compound > organic heterobicyclic compound > pyrimidopyrimidine

... > chemical entity > molecular entity > polyatomic entity > molecule > cyclic compound > heterocyclic compound > heterobicyclic compound > organic heterobicyclic compound > pyrimidopyrimidine

... > chemical entity > molecular entity > polyatomic entity > molecule > cyclic compound > bicyclic compound > heterobicyclic compound > organic heterobicyclic compound > pyrimidopyrimidine