c13h9n

from The Collaborative International Dictionary of English v.0.48

Phenanthridine \Phe*nan"thri*dine\, n. [Phenanthrene +
   pyridine.] (Chem.)
   A nitrogenous hydrocarbon base, {C13H9N}, analogous to
   phenanthrene and quinoline.
   [1913 Webster]