Patent ID: 6995281
Filing Date: 2006-02-07
Classification: A61P,B01J,C07B,C07C

Abstract:
1. A method of making a salt of S-[2-[(1-Iminoethyl)-amino]ethyl]-2-methyl-L-cysteine, comprising removing counterions from S-[2-[(1-Iminoethyl)-amino]ethyl]-2-methyl-L-cysteine dihydrochloride in solution by contacting S-[2-[(1-Iminoethyl)-amino]ethyl]-2-methyl-L-cysteine dihydrochloride in solution with an appropriate ion exchange membrane, separating the solution containing S-[2-[(1-Iminoethyl)-amino]ethyl]-2-methyl-L-cysteine from the ion exchange membrane, and contacting the S-[2-[(1-Iminoethyl)-amino]ethyl]-2-methyl-L-cysteine with at least one counterion other than hydrochloride ion.