This is a Phase 1, randomized, double-blind, placebo-controlled, single dose, first in human safety, tolerability, and pharmacokinetic study of SPY003-207 in healthy participants.

Inclusion Criteria:

• Healthy men and women
• Willing and able to attend the necessary visits to the CRU, comply with all testing requirements, remain at the study site unit for the duration of the confinement period and return for the outpatient visits

Exclusion Criteria:

• Participation in more than one cohort
• Evidence of clinically significant abnormality or disease
• Known history of illicit drug use or drug abuse, harmful alcohol use or alcoholism, and/or smoking or nicotine-containing product use within 3 months prior to the first dose of study drug
• History of severe allergic reactions or hypersensitivity
• Donation or loss of >1 unit of whole blood within 1 month prior to dosing