sedoheptulose

noun

se·​do·​hep·​tu·​lose ˌsēd-ō-ˈhep-tyə-ˌlōs, -ˌlōz 

: an amorphous ketose sugar C₇H₁₄O₇ that plays a role in carbohydrate metabolism but is not fermented by yeast and that is a laboratory source of D-altrose and D-ribose