26539-16-2 5567-52-2 Chitintetraose Chitotetraose Chitotetrose D-Glucose, O-2-amino-2-deoxy-beta-D-glucopyranosyl-(1-4)-O-2-amino-2-deoxy-beta-D-glucopyranosyl-(1-4)-O-2-amino-2-deoxy-beta-D-glucopyranosyl-(1-4)-2-amino-2-deoxy-