Levocetirizine Impurity 16

(2R,3R,4R,5S) -2,4,5,6-tetrahydroxy-3- (((2R,3R,4S,5S,6R) -3,4,5-trihydroxy-6- (hydroxymethyl) tetrahydro-2H-pyran-2-yl) oxy) hexyl 2- (2- (4- ((R) - (4-chlorophenyl) (phenyl) methyl) piperazin-1-yl) ethoxy) acetate