[chemical substances]
Count: 378c;28s
   reactive intermediates
  Count: 74c;14s
     Class cations [X+]
    Count: 21c;13s
       Class onium compounds
      Count: 8c;13s
         Class halonium ions [R2X+ (X=halogen)]
        Count: 4c;4s
           Class bromonium ions [R2Br+]
          Count: 1s
             1 bromonium [H2Br+]
            Count: -