- The O-polysaccharide from the lipopolysaccharide of Providencia stuartii O44 contains L-quinovose, a 6-deoxy sugar rarely occurring in bacterial polysaccharides. Kocharova, N.A., Ovchinnikova, O.G., Toukach, F.V., Torzewska, A., Shashkov, A.S., Knirel, Y.A., Rozalski, A. Carbohydr. Res. (2005)