alpha-D-Rhap4NFo-(1->2)-alpha-D-Rhap4NFo-(1->3)-alpha-D-Rhap4NFo-(1->2)-alpha-D-Rhap4NFoO[CH2]5C(O)NH2CH2CH2NH2-3,4-dioxocyclobutylaminomethyl group
alpha-d-rhap4nfo-(1->2)-alpha-d-rhap4nfo-(1->3)-alpha-d-rhap4nfo-(1->2)-alpha-d-rhap4nfoo[ch2]5c(o)nh2ch2ch2nh2-3,4-dioxocyclobutylaminomethyl group
An organyl group consisting of a tetrasaccharide of <em>N</em>-formyl-α-<small>D</small>-perosamine residues linked sequentially (1→2), (1→3) and (1→2), and linked at the reducing end glycosidically to a 2-[2-(hexanamido)ethylamino]-3,4-dioxocyclobutylaminomethyl group used as a tether for conjugation to proteins.