[bromidewind]

I recently encountered  a solute known as potassium cyclic 2,3-diphosphoglycerate. I know what the structure of 2,3-diphosphoglycerate is, but I don't what the potassium cyclic part is for. I've tried searching the web, but I know that things often get mixed up in the changing of nomenclature., or some prefer one name over the other. So I'm asking if anybody has a structure of this solute, or at least hints on how to draw it.

Thanks.

[Yggdrasil]

Here's the structure:  http://www.genome.jp/dbget-bin/www_bget?cpd:C06189

The potassium is acting as a counter ion for the groups that are deprotonated (like the phosphates and carboxylic acid).

[bromidewind]

Thanks Do you know if the L form has any distinctive properties, and if it is naturally synthesized by hyperthermophiles?