Pyrrole is a colourless to brown liquid with chloroform odour, having the chemical formula C₄H₅N and molecular mass 114.2. It is used to produce pharmaceuticals and electroconducting polymers.

Chemical structure:

  H      H
   \    /
    C--C
   //  \\
H--C    C--H
    \  /
      N
      |
      H

Sources:
http://omlc.ogi.edu/spectra/PhotochemCAD/html/pyrrole.html
www.basf.com/businesses/chemicals/diols/pdfs/pyrrole.pdf