The molecule is a branched amino tetrasaccharide consisting of three alpha-L-rhamnose residues linked sequentially (1->2) and (1->3) (one at the reducing end) and a single N-acetyl beta-D-glucosaminyl residue linked (1->3) to the central rhamnose.
N-[(2S,3R,4R,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-2-[(2S,3S,4R,5R,6S)-3-hydroxy-2-methyl-6-[(2R,3R,4R,5S,6S)-2,3,5-trihydroxy-6-methyloxan-4-yl]oxy-5-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-4-yl]oxyoxan-3-yl]acetamide