Question: In addition to fructose (Practice Problem 22.12) and sorbose (Problem 22.24), there are two other 2-ketohexoses, psicose and tagatose. D-Psicose yields the same phenylosazone as

In addition to fructose (Practice Problem 22.12) and sorbose (Problem 22.24), there are two other 2-ketohexoses, psicose and tagatose. D-Psicose yields the same phenylosazone as D-allose (or d-altrose); D-tagatose yields the same osazone as D-galactose (or D-talose).
What are the structures of D-psicose and d-tagatose?

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