a number of unusual o-methyl sugars ( 2-o-methyl-d-galactose , 2,3-di-o-methyl-d-galactose , 2-o-methyl-l-fucose ) as well as 3,6-dideoxy-d-xylo-hexose ( abequose ) were identified in the r. gelatinosa polysaccharides . o-methyl and dideoxy sugars however , are typical constituents of o-specific chains of the lipopolysaccharides of gram-negative bacteria ( rhodospirillaceae and enterobacteriaceae , respectively ) .
C0016945
galactose
C0019494
hexose