N,N'-diacetylchitobiosamine

2-acetamido-4-O-(2-acetamido-2-deoxy-β-D-glucopyranosyl)-1-amino-1,2-dideoxy-D-glucitol

1-acetamido-4-O-(2-acetamido-2-deoxy-β-D-glucopyranosyl)-2-amino-1,2-dideoxy-D-glucitol