19272-54-9 21217-11-8 Methyl N,N'-diacetyl-beta-D-chitobioside O-Methyl-di-N-acetyl beta-chitobioside beta-D-Glucopyranoside, methyl 2-(acetylamino)-4-O-(2-(acetylamino)-2-deoxy-beta-D-glucopyranosyl)-2-deoxy-