Last week's molecule was L-dopa. The winner was Raul A. Félix de Sousa (again, but this time only by four minutes!) [Monday's Molecule #190].
This week's molecule is much more complicated and it's also much more important. You need to identify this complex making sure you distinguish it from other similar complexes. You don't need to name the exact species but you should have some idea of which organisms have this complex and which ones don't. There's not enough room in the comments for the complete IUPAC name!
You'll get special bonus points (and the expensive lunch in the dining room instead of the pub) for explaining how an irreducibly complex structure like this could have evolved.
Post your answer as a comment. I'll hold off releasing any comments for 24 hours. The first one with the correct answer wins. I will only post mostly correct answers to avoid embarrassment. The winner will be treated to a free lunch.
There could be two winners. If the first correct answer isn't from an undergraduate student then I'll select a second winner from those undergraduates who post the correct answer. You will need to identify yourself as an undergraduate in order to win. (Put "undergraduate" at the bottom of your comment.)
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