Efficacy and Safety of TRC041266 in Patients With Heart Failure, LVEF ≥40%, Diastolic Dysfunction and Type 2 Diabetes Mellitus

1. Men and women aged 40-70 years (both inclusive)

2. Type 2 diabetes mellitus on stable hypoglycemic therapy for >1 month

3. Diagnosed with heart failure* according to 2016 ESC Guidelines for Chronic Heart Failure for at least 6 months and receiving SoC for at least 3 months *HF - a clinical syndrome characterized by typical symptoms (e.g. breathlessness, ankle swelling and fatigue) that may be accompanied by signs (e.g. elevated jugular venous pressure, pulmonary crackles and peripheral edema) caused by a structural and/or functional cardiac abnormality, resulting in a reduced cardiac output and/or elevated intra-cardiac pressures at rest or during stress

4. Participants with LVEF ≥40% including HFpEF according to ESC criteria, diagnosed by ECHO, confirmed by core ECHO laboratory AND having moderate to severe diastolic dysfunction as described in 'Classification of Diastolic Dysfunction'

5. NT-proBNP (N-terminal fragment of brain natriuretic peptide) 250-3500 pg/mL (both inclusive) For participants who have atrial fibrillation, the inclusion qualification would be 750- 3500 pg/ml (both inclusive)

6. Treatment with stable# doses of loop diuretics for >1 month at a daily dose of furosemide of ≥40 mg or equivalent (1 mg of bumetanide or 10 mg of torasemide) or alternatively, 20 mg furosemide + mineralocorticoid receptor antagonist or equivalent (0.5 mg of bumetanide + mineralocorticoid receptor antagonist or 5 mg of torasemide + mineralocorticoid receptor antagonist) or equivalent as per the regional SoC

7. On stable# doses of beta-blockers for >1 month

8. Participants willing to give written informed consent (prior to any study-related procedures being performed) and able to adhere to the study restrictions and assessments schedule

1. Known hypersensitivity to any ingredient of the study medication

2. Heart failure caused by myocarditis, cor-pulmonale, congenital heart disease,constrictive pericarditis, idiopathic hypertrophic or restrictive cardiomyopathy, amyloid heart disease or rheumatic heart disease

3. Significant valvular heart disease including severe mitral regurgitation or left ventricular (LV) aneurysm as judged by the investigator and/or echo core-laboratory

4. History of MI, CABG surgery, PCI or other major surgery, stroke or TIA in past 6 months

5. Patients who are anticipated to require coronary revascularization; patients with angina must be evaluated by a cardiologist to determine the need for revascularization

6. NYHA class IV

7. A score of less than 12 points on adequately explained and administered MLHFQ points 2, 3, 4, 5, 7, 8, 12 and 13

8. Hospitalization for heart failure with overnight stay in the past 3 months

9. Participants with symptomatic or sustained VT* in the past 6 months and planned for cardiac resynchronization therapy (CRT) or implantation of ICD for the duration of the study.

10. Atrial fibrillation or flutter with a resting ventricular rate >110 beats per minute

11. Unable to walk or has any contraindication to 6-minute walk test or those in whom longest distance walked in supervised 6 minutes (6MWTD) at baseline was <100 m or >350m

12. Systolic BP < 100 mmHg or ≥ 160 mmHg or Diastolic BP ≥ 100 mmHg at screening

13. Hb <12 g/dL

14. HbA1c >11%

15. eGFR <30 mL/min/1.73m2 (calculated by Modification of Diet in Renal Disease formula) [eGFR (mL/min/1.73 m²) = 175 × (Scr)-1.154 × (Age)-0.203 × (0.742 if female) × (1.212 if African American) (conventional units)]

16. Liver enzymes (AST or ALT) exceeding 3 times the upper limit of normal range at screening and considered clinically significant by the investigator

17. Current hyponatremia (Na+ <130 mmol/L) or hyperkalemia (K+ >5.5 mmol/L)

18. Participants on insulin as monotherapy for diabetes

19. History of gastrointestinal disorder (e.g. malabsorption syndrome) that could interfere with study drug absorption

20. Known to have positive test for HIV, Hepatitis B, Hepatitis C at the time of screening

21. History of malignancy in last 3 years other than basal cell carcinoma

22. Pregnant or lactating women, or female of childbearing potential, who are neither surgically sterilized nor willing to use reliable contraceptive methods (double barrier methods or intrauterine device)

23. Men with partners of childbearing potential not willing to use reliable contraception methods

24. Current participation (including prior 30 days) in any other therapeutic clinical trial

25. In the opinion of the investigator, any finding which would interfere with the objectives of the study, patient is unable to cooperate with any study procedures, unlikely to adhere to the study procedures, keep appointments, or plan to relocate during the study