Proposed structures of succinoglycan monomers and oligomers. (A) Monomers; (B) Dimers; (C) Trimers. The letters U, V, W, X, Y, and Z indicate the sites for possible succinylation. Abbreviations: Glc, glucose; Gal, galactose; Ac, acetyl; Pyr, pyruvyl; Suc, succinyl.