Blood group A pentasaccharide

Blood group A pentasaccharide (A-Pentasaccharide), an oligosaccharide found in urine, inhibits the attachment of the anti-A antibody to the blood group A antigen [1].

O([C@@H]1[C@@H](O[C@@H]2[C@H](NC(C)=O)[C@@H](O)[C@@H](O)[C@@H](CO)O2)[C@@H](O)[C@@H](CO)O[C@H]1O[C@@H]([C@H](O[C@H]3[C@@H](O)[C@H](O)[C@H](O)[C@H](C)O3)[C@H](C=O)O)[C@@H](CO)O)[C@H]4[C@@H](O)[C@H](O)[C@H](O)[C@H](C)O4