[Babcock_Hall]

We make derivatives of (iso)nicotinamides.  In some cases the C-13 linewidths are broader for carbon atoms directly attached to the pyridine nitrogen, but sometimes not.  There might be a relationship with whether or not the pyridine nitrogen is alkylated.  I seem to recall reading about this many years ago and thinking that it was in some way related to the fact that N-14 is quadrupolar, but I cannot recall the details.  Does anyone have any thoughts?

[discodermolide]

Yes, I remember that as well.
http://www.chem.wisc.edu/areas/reich/nmr/07-multi-04-quadrupolar.htm