C5H3N.(CH3)2

from The Collaborative International Dictionary of English v.0.48

Lutidine \Lu"ti*dine\, n. [From toluidine, by transposition.]
   (Chem.)
   Any one of several metameric alkaloids, {C5H3N.(CH3)2}, of
   the pyridine series, obtained from bone oil as liquids, and
   having peculiar pungent odors. These alkaloids are also
   called respectively {dimethyl pyridine}, {ethyl pyridine},
   etc.
   [1913 Webster]