Xylulose
<p><b>Xylulose</b> is a <a href="http://en.wikipedia.org/wiki/Ketopentose" title="Ketopentose" class="mw-redirect">ketopentose</a>, a <a href="http://en.wikipedia.org/wiki/Monosaccharide" title="Monosaccharide">monosaccharide</a> containing five <a href="http://en.wikipedia.org/wiki/Carbon" title="Carbon">carbon</a> <a href="http://en.wikipedia.org/wiki/Atom" title="Atom">atoms</a>, and including a <a href="http://en.wikipedia.org/wiki/Ketone" title="Ketone">ketone</a> <a href="http://en.wikipedia.org/wiki/Functional_group" title="Functional group">functional group</a>. It has the <a href="http://en.wikipedia.org/wiki/Chemical_formula" title="Chemical formula">chemical formula</a> <a href="http://en.wikipedia.org/wiki/Carbon" title="Carbon">C</a><sub>5</sub><a href="http://en.wikipedia.org/wiki/Hydrogen" title="Hydrogen">H</a><sub>10</sub><a href="http://en.wikipedia.org/wiki/Oxygen" title="Oxygen">O</a><sub>5</sub>. In nature, it occurs in both the <small>L</small>- and <small>D</small>-<a href="http://en.wikipedia.org/wiki/Enantiomer" title="Enantiomer">enantiomers</a>.</p>