A Participant- and Investigator--Blinded, Placebo- Controlled, Randomized, Multipart, Single and Multiple Ascending Dose Study to Investigate the Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of OJR520 in Healthy Volunteers and Participants With Chronic Kidney Disease

Inclusion Criteria: Able to provide written informed consent before any assessment is performed. Part A (HV): • Healthy male and female participants in good health as determined by past medical history, physical examination, vital signs, 12-lead ECG, and laboratory tests at screening and baseline within the normal range. Parts B \& C (CKD) • Male and female participants 18 to 65 years of age. Exclusion Criteria: * Women of childbearing potential. * Sexually active males unwilling to use contraception. Part A (HV): * Clinically significant abnormal blood pressure, defined as SBP \<90 m…