136366-18-2 F-4-Mgx Fuco-4-O-methylglucuronoxylan L-Fuco-4-O-methyl-D-glucurono-D-xylan beta-D-Xylopyranose, O-4-O-methyl-alpha-D-glucopyranuronosyl-(1-2)-O-beta-D-xylopyranosyl-(1-4)-O-(O-6-deoxy-alpha-L-galactopyranosyl-(1-2)-D-xylopyranosyl-(1-3))-