Warf, warf...

The other day, I was interested to discover, quite by chance, that warfarin, a medicine with which I have an intimate relationship, has a surprisingly simple chemical structure. Just a couple of benzene rings tied together with a few bits and bobs - adding up to a very modest 19 carbon atoms, 16 hydrogens and rounded out by 4 oxygens.

Not some protein with thousands of atoms in some fantastic arrangement in three dimensions at all and one might have thought that it was not complicated enough to interact with a real organic substance.

Illustration taken from Wikipedia.