UAB 2242: A Prospective Randomized, Double-Blind, Placebo-Controlled, Multi-Center Phase IIb Study to Evaluate The Efficacy and Safety of Mocravimod as an Adjunctive and Maintenance Treatment in Adult Acute Myeloid Leukemia (AML) Patients undergoing Allogeneic Hematopoietic Stem Cell Transplantation (HSCT) (PKRPC001)