Patent ID: 8642637

Claim:
Pharmaceutically acceptable salts of a compound having formula (I): wherein: Het is selected from the group consisting of furyl and thienyl; R 1 , R 2 , R 3 and R 4 are each independently selected from the group consisting of hydrogen and alkyl; n is 0, 1 or 2; and the salts are base addition salts; wherein the salts are selected from the group consisting of sodium salt, lithium salt, potassium salt, calcium salt, magnesium salt, arginine salt, lysine salt, methanamine salt, dimethylamine salt, trimethylamine salt, ethylamine salt, diethylamine salt, triethylamine salt, ethanolamine salt, piperazine salt, dibenzyl ethylenediamine salt, meglumine salt, tromethamine salt, tetramethyl quaternary ammonium salt, tetraethyl quaternary ammonium salt and choline salt.