c9h9n

from The Collaborative International Dictionary of English v.0.48

Skatol \Ska"tol\, n. [Gr. ???, dung + -ol.] (Physiol. Chem.)
   A constituent of human faeces formed in the small intestines
   as a product of the putrefaction of albuminous matter. It is
   also found in reduced indigo. Chemically it is methyl indol,
   {C9H9N}.
   [1913 Webster]