... Experimental Therapy, Polish Academy of Sciences, Wrocław, Poland;2N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia The O-speci c polysaccharide of Citrobacter ... the authentic sample from the OPS of Citrobacter PCM 1487 [12] and PCM 1525 [13]. The absoluteLconfiguration of Rha andDconfiguration of Fuc and ara4dHex were determined by GLC-MS of the acetylated ... bygel-permeation chromatography on a column of SephadexG-50 to give OPS-I or OPS-II (fraction P1), core oligosac-charides (fraction P3) and a low-molecular-mass materialcontaining 3-deoxy-D-manno-oct-2-ulosonic...