Structural studies of the capsular antigen of Haemophilus influenzae type c

The structure of the capsular antigen from Haemophilus influenzae type c has been investigated, n.m.r. spectroscopy being the principal method used. It is concluded that the antigen is composed of repeating-units having the following structure: formula: (see text). O-Acetyl groups are present in approximately 90% of the repeating-units.