Patent ID: 7767850

Claim:
A method of making generally orderly packed agglomerate crystalline S-[2-[(1-Iminoethyl)amino]ethyl]-2-methyl-L-cysteine maleate hydrochloride utilizing a crystallization procedure comprising adding an anti-solvent to a solvent solution in which is dissolved S-[2-[(1-Iminoethyl)amino]ethyl]-2-methyl-L-cysteine maleate hydrochloride, thereby forming a system comprising two phases, and precipitating generally orderly packed agglomerate crystalline S-[2-[(1-Iminoethyl)amino]ethyl]-2-methyl-L-cysteine maleate hydrochloride, wherein the anti-solvent comprises acetonitrile or acetone and the solvent comprises 1-butanol or N,N-dimethylformamide.