Cas No. 349535-15-5, 1-(1-METHYLPIPERIDIN-4-YL)PIPERAZINE 3HCL

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CAS No. 349535-15-5 is a tri-HCl salt form of CAS No. 23995-88-2. 

In the synthesis of Zavegepant, the secondary amine group on the CAS No. 23995-88-2 reacts with the carboxylic acid group at the chiral center on CAS No. 928014-62-4, which is formed by reacting with Zavegepant intermediates CAS No. 855778-84-6 and CAS No. 1414976-14-9.

Compared with the free base CAS No. 23995-88-2, the tri-HCl salt CAS No. 349535-15-5 can be more stable. 

However, the tri-HCl form might be prone for hydroscopy.