All
 D03 Heterocyclic Compounds D006571 +
 D03.383 Heterocyclic Compounds, 1-Ring D006573 +
 D03.383.725 Pyridines D011725 +
 D03.383.725.762 Pyridinium Compounds D011726 +
 D03.383.725.762.232 Cetylpyridinium D002594 
 D03.383.725.762.300 Desmosine D003895 
 D03.383.725.762.352 Diquat D004178 
 D03.383.725.762.500 Isodesmosine D007524 
 D03.383.725.762.600 Obidoxime Chloride D009768 
 D03.383.725.762.621 Paraquat D010269 
 D03.383.725.762.740 Pyridostigmine Bromide D011729 
 D03.383.725.762.760 Pyrithiamine D011745 
 D03.383.725.762.900 Trimedoxime D014289 
 D03.383.725.762.925 Viologens D014755 +
 D03.383.725.762.550 1-Methyl-4-phenylpyridinium D015655