... configurations. The 1Hand 13 C NMR chemical shifts for H5 and C5, d 3.58 and 72.8 in Rha, d 4. 26 and 68 .0 in FucIand d 4.02 and 67 .6 in FucII,respectively, indicated that Rha is b-linked and both ... containedsignals for four anomeric carbons in the region d 94. 8–9 9.8,three CH3-C groups (C6 of Rha and Fuc), one C-CH2-Cgroup at d 29 .5, other sugar ring carbons in the region d 67 . 6 7 8.1, and one O-acetyl ... 3-substitutedFuc and 3-substituted Rha in the molar ratio 2:1.These data suggest that the OPS-I and OPS-II have an identical branched tetrasaccharide repeating unit. It consists of the main chain containing...