Corwin Hansch

In the whole Nobel betting, I think we forgot someone significant- Corwin Hansch, whose QSAR has now become ubiquitous in medicinal chemistry and biology, both theoretical and experimental. Also, I think Hansch is one of the first ones, if not the first one, to apply classical physical organic chemistry (Hammett etc.) to medicinal chemistry and bioactivity.

Updates: New thoughts.
Albert Overhauser: Nuclear Overhauser Effect
Norman Allinger: Molecular Mechanics