the purified product ( almost identical with the phytoglycolipid isolated from flax seed ) was a ceramide attached through phosphate diester linkage to an oligosaccharide , which consisted of the usual trisaccharide unit ( inositol , hexuronic acid , hexosamine ) to which were attached mannose , galactose , and arabinose .
C0028959
oligosaccharide
C0041102
trisaccharide