Olsalazine

Olsalazine is an anti-inflammatory medication used in the treatment of ulcerative colitis.[2][3] It is sold under the brand name Dipentum.[4] Olsalazine itself is a pro-drug of mesalazine (5-aminosalicyclic acid or 5-ASA) and is not absorbed in the small intestine. Instead it continues through to the colon where it is cleaved into two molecules of 5-ASA by azoreductases produced by colonic bacteria. Olsalazine thus exerts its anti-inflammatory e... [wikipedia]