PROCESS FOR THE PREPARATION OF POLYMORPHS OF 5-[4-[4-(5-CYANO-1H-INDOL-3-YL)BUTYL]-1-PIPERAZINYL]-2-BENZOFURAN CARBOXAMIDE HYDROCHLORIDE

摘要

The present invention relates to formic acid salt as well as its crystalline form of antidepressant drug i.e., 5-[4-[4-(5-cyano-1H-indol-3-yl)butyl]-1-piperazinyl]-2-benzofuran carboxamide compound of formula-1a, which is useful in the preparation of 5-[4-[4-(5-cyano-1H-indol-3-yl)butyl]-1-piperazinyl]-2-benzofuran carboxamide hydrochloride compound of formula-1b and process for its preparation.