Ribulose-1,5-bisphosphate (
RuBP) is an
organic substance that is involved in
photosynthesis. It is a colourless anion. a double
phosphate ester of the ketose (
ketone-containing sugar) called
ribulose. Salts of RuBP can be isolated, but its crucial biological function happens in solution. To simplify the presentation, the image in the above table depicts the acid form of this anion.