It's not a song...

There's a set of questions going around LJ which includes "What song is stuck in your head right now?" I don't have a song stuck in my head at the moment.

I've got something else stuck in my mind for no reason I can work out. A chemical, or at least one of the names of a chemical. For a while now, I've had benzopyridine going through my mind. Why? I don't know. Maybe it just sounds neat (I like chemical names. Yes, really.) and that could be why I still have benzopyridine going through my mind rather than quinoline which is the preferred name nowadays.