#base__alkali  any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water; "bases include oxides and hydroxides of metals and ammonia"
  supertype:  #chemical_compound__compound  (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight
  subtype:  #pyridine  a toxic colorless flammable liquid organic base with a disagreeable odor; usually derived from coal
     subtype:  #triphosphopyridine  a pyridine ring with three phosphorus groups
  subtype:  #purine  a colorless crystalline nitrogen-containing organic base; the parent compound of various biologically important substances
  subtype:  #purine.base  any of several bases that are derivatives of purine
     subtype:  #adenine  (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
     subtype:  #guanine  a purine base found in DNA and RNA; pairs with cytosine
  subtype:  #imidazole__iminazole__glyoxaline  an organic base C3H4N2; a histamine inhibitor
  subtype:  #melamine__cyanuramide  a white crystalline organic base; used mainly in making melamine resins
  subtype:  #pyrimidine  any of several basic compounds derived from pyrimidine
     subtype:  #cytosine  a base found in DNA and RNA and derived from pyrimidine; pairs with guanine
     subtype:  #thymine  a base found in DNA (but not in RNA) and derived from pyrimidine; pairs with adenine
     subtype:  #uracil  a nitrogen-containing base found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine

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