ribulose-1, 5-diphosphate

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ribulose-1, 5-diphosphate (RDP) A phosphorylated derivative of the ketopentose monosaccharide ribulose, which acts as an acceptor molecule for carbon dioxide in the Calvin cycle. The reaction between 1 molecule each of these 2 substrates results in the formation of 2 molecules of phosphoglyceric acid.