Name Key Intermediate CAS No.
Levocetirizine & Cetirizine  (-)-1-[(4-Chlorophenyl) Phenylmethyl] Piperazine 130018-88-1
1-(4-Chlorobenzhydryl) piperazine 303-26-4
2-(2-Chloroethoxy) acetamide 36961-64-5
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