Each subject (in a fasting state) will receive each of the 4 treatments (A, B, C, and D) in a balanced, 4-period crossover design. Each treatment consists of a single oral dose of 100 mg or 200 mg of DPOC-4088 in either prolonged release formulation (16 or 20 hr). Subjects will arrive at the study unit for an overnight fast of at least 10 hrs the evening before each dosing period and remain in the unit for at least 24 hrs after dosing. Standard meals will be provided and subjects will receive their first meal after dosing at 4 hrs post-dose. Blood samples will be drawn for PK and PD evaluations immediately prior to dosing and at specified time intervals for 48 hrs post-dosing. Each dosing period will be separated by at least a 5-day washout period that is preferentially not to exceed 10 days.