Monday's Molecule #198

The last "Monday's Molecule" was 2R,3S-isocitre [Monday's Molecule #197]. The winner was Evey Salara. She's probably too far away to come for lunch.

This week's molecule is very strange looking but it serves a very important role in some species. What is the molecule, what species have it, and what does it do?

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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Posted in: Biochemistry