This is a double-blind, randomized, placebo-controlled, multiple ascending dose study, in at least three ascending cohorts. Twenty-four subjects will be enrolled initially in the first three cohorts, with up to 40 subjects to be enrolled overall if additional cohorts are required to reach the maximum tolerated dose (MTD). The cohorts will be enrolled in two groups of 4 each with approximately 7 days between groups to conduct safety monitoring committee review for approval to proceed to the second group in the cohort. Eight subjects will be enrolled per cohort, randomized 3:1 to N6022: placebo. Each subject will undergo screening (Day -28 to Day -2) and, if eligible, they will be instructed to begin a low-nitrate diet on Day -4. Subjects will return to the clinical site on Day -1, and eligibility will be reconfirmed. Eligible subjects will receive a dose of investigational medicinal product ([IMP], N6022 or placebo) by intravenous (IV) infusion on study Days 1 through 7 and will be followed for safety, PK, and PD until discharge on the morning of Day 8. Subjects will return to the clinic for a follow-up visit on Day 15 (± 1 day) and will be contacted via telephone on Day 28 (± 1 day) for the end-of-study safety follow-up visit. Participation of an individual subject may last approximately 56 days from the time of screening until the end-of-study follow-up visit.