Cetirizine Impurity A
Cetirizine IMP 3′-N-{[4-(Acetylamino)phenyl]sulfonyl}-3′,3′-didemethylazithromycin; (RS)-1-[(4-Chlorophenyl)phenylmethyl]piperazine; 1,4-bis(4-Chlorobenzhydryl)piperazine