Beta-ketopentanoate

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Beta-ketopentanoate is a 5-carbon ketone body. It is made from odd carbon fatty acids in the liver and rapidly enters the brain. As opposed to 4-carbon ketone bodies, beta-ketopentanoate is anaplerotic (see anaplerotic reactions) meaning it can refill the pool of TCA cycle intermediates. The triglyceride triheptanoin is used clinically to produce beta-ketopentanoate.

http://ajpendo.physiology.org/cgi/reprint/00366.2005v1.pdf