A Phase II Study to Explore the Safety and Activity of Dersalazine in Patients With Mild to Moderate Ulcerative Colitis

Inclusion Criteria: * Age 18 to 65 inclusive * Male, non-child-bearing female or fertile female with appropriate contraception. * Mild to moderate confirmed active ulcerative colitis * Able and willing to give informed consent Exclusion Criteria: * Colitis of other cause * Pregnancy, inadequate contraception for fertile female patients * Liver or kidney disease, unstable cardiovascular disease, coagulation disorder. * Other significant medical condition that preclude participation at investigator criteria * Allergy or hypersensitivity to salicylates * Previous or concomitant treatment for ulcerative colitis interfering with safety or activity assessments