A Phase 2 Study of D-2570 in Subjects With Moderately to Severely Active Ulcerative Colitis

The study is divided into two parts, Part A and Part B. Part A will include 30 subjects, while Part B will include 90 subjects. The primary difference between Part A and Part B is that Part A includes a single-dose pharmacokinetic (PK) study period. Other aspects, such as population selection, randomization and blinding, dosing regimens, and outcome assessments (safety and efficacy), are consistent between Part A and Part B.