577-76-4 CBS CHITOBIOSE Chitodextrin N-[2-[5-acetylamino-4,6-dihydroxy-2-(hydroxymethyl)tetrahydropyran-3-yl]oxy-4,5-dihyrdoxy-6-(hydroxymethyl)tetrahydropyran-3-yl]acetamide diacetylchitobiose