The molecule is an alpha-L-rhamnoside consisting of D-ribitol having an alpha-L-rhamnosyl residue attached at the 4-position. It has a role as a hapten. It derives from a ribitol.
(2S,3S,4R)-4-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxypentane-1,2,3,5-tetrol