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Gnetophyta xylan oligosaccharides are acetylated on alternate xylosyl residues. Glucuronoxylanase GH30 products from E. major xylan were labeled with 2-AA and separated by HILIC. High-energy MALDI-CID of UX6Ac (A), UX6Ac2 (B), and UX6Ac3 (C). The position of the acetate on the nonreducing Xyl is unknown.
