All
 D03 Heterocyclic Compounds D006571 +
 D03.661 Heterocyclic Oxides D006577 +
 D03.661.243 Cyclic N-Oxides D003497 +
 D03.661.368 Cyclic P-Oxides D003498 
 D03.661.493 Cyclic S-Oxides D003499