Cetirizine EP Impurity B Catalogue No. - VL330002 CAS No. - 113740-61-7 Molecular Formula - C19H23Cl3N2O2 Molecular Weight - 417.76 IUPAC Name - (RS)-2-[4-[(4-Chlorophenyl)phenylmethyl]piperazin-1-yl]acetic acid dihydrochloride Synonyms - Cetirizine Acetic Acid / Levocetirizine impurity B (HCl salt)