#pyrimidine  any of several basic compounds derived from pyrimidine
  supertype:  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"
  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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