140447-98-9 D-erythro-beta-D-allo-Octofuranuronic acid, 3,7-anhydro-1-deoxy-1-(2,3-dihydro-4-formyl-2-oxo-1H-imidazol-1-yl)- Nikkomycin So(X) Nikkomycin So-X Nikkomycin sox