"http://www.patentstorm.us/patents/5731357/description.html
CONCLUSION. The administration of the preparation "Ropren" enables to achieve clinical remission for the patients with disseminated sclerosis."
This patent appears to have expired in 2006, through failure to pay the maintenance fee, according to this link:
http://www.uspto.gov/go/og/2006/week21/patexpi.htm