Exploratory Ph 2A, Double-Blind, Placebo-Controlled Dose Escalation Study of Safety, Tolerability, PD, & PK of HU6 for Subjects With Obese HFpEF

This is a Phase 2A, randomized, parallel-group, placebo-controlled, double-blind, within subject dose escalation trial with 3 dose levels of HU6 and placebo. Subjects will be randomized (1:1) either to HU6 or placebo. Two dose levels will be administered in sequential order (150 mg daily followed by 300 mg daily), each for 20 days, to reach the third and highest dose of 450 mg daily if safety and tolerability are demonstrated at the lower 2 preceding doses. Administration of the 450 mg high dose will continue for a total of 94 days, with a safety follow-up visit within \~14 days of the last dose. Subjects will be screened over a 40-day period to determine their eligibility based on specific history, physical, laboratory, and imaging evaluations as per the Schedule of Assessments. While a single screening clinical site visit is indicated, an additional visit may be necessary to complete the screening procedures due to scheduling issues. A number of these assessments will serve as the baseline prior to drug administration. A central laboratory will be used for all assessments, including MRI, DEXA, clinical blood/plasma measures, transthoracic echocardiography, and CPET.