CAS Number: 130018-88-1
Molecular Formula: C17H19ClN2
Molecular Weight: 286.79916
EINECS Number: 206-137-4 

1. Synthesis of Antihistamine Drugs
As a key intermediate for levocetirizine (Levocetirizine), this compound is used for the synthesis of the third-generation antihistamine drug levocetirizine.
Levocetirizine effectively treats allergic rhinitis, conjunctivitis, and skin allergy symptoms by selectively antagonizing H1 receptors, and has significantly reduced central sedative side effects compared to cetirizine. 
2. Other Medical Applications
Antipsychotic drugs: The piperazine structure may be utilized for the development of dopamine D2 receptor or 5-HT receptor modulators, such as analogues of aripiprazole
Neuroscience research: As a chiral ligand, it can be used in binding experiments of dopamine or serotonin receptors and in the study of stereoselective drugs
Antiparkinsonian drugs: Potential dopaminergic regulators, improving motor disorders 
3. Chemical Synthesis and Catalysis
Chiral intermediates: Used in the synthesis of complex chiral drugs (such as virazoxone analogues)
Catalyst ligands: The piperazine structure can be involved in the preparation of auxiliary ligands for asymmetric synthesis‌