3-aminopropyl 2-acetamido-2,3-dideoxy-3-{[(3R)-3-hydroxybutanoyl]amino}-beta-D-glucopyranuronosyl-(1->4)-2-acetamido-3-O-acetyl-2,6-dideoxy-alpha-L-galactopyranosyl-(1->3)-2-acetamido-2,6-dideoxy-alpha-D-glucopyranoside