The purpose of this study is to assess the safety, tolerability, pharmacokinetics and pharmacodynamics of single ascending doses of ABP-671 administered orally in healthy volunteers.

Primary Objectives:

• To assess the safety and tolerability of single ascending oral doses of ABP-671 in Healthy Volunteers (HVs).

Secondary Objectives:

• To characterize the pharmacokinetics (PK) and pharmacodynamics (PD) profiles of single ascending oral doses of ABP-671 in HVs.

Inclusion Criteria

1. Healthy (no clinically significant health concerns), as determined by medical history, physical examination, 12-lead ECG, and vital signs.
2. Participants serum uric acid level at screening ≥ 4.0 mg/dL to ≤ 5.5 mg/dL for males, and ≥ 4.0 mg/dL to ≤ 5.0 mg/dL for females.
3. Participants must have a body mass index (BMI) between 18 and 32 kg/m2 and a body weight of 50 kg or higher.
4. Participants must have normal blood chemistry or results considered not clinically significant by the investigator including electrolytes, alkaline phosphatase, total protein, albumin, aspartate aminotransferase (AST), alanine aminotransferase (ALT), total bilirubin, uric acid, creatinine, blood urea nitrogen (BUN), and glucose at Screening Visit and at Pre-dose Visit.
5. Participants are able to understand the study procedures and risks involved and must provide signed informed consent to participate in the study.

Exclusion Criteria

1. Participants with any history or clinical manifestations of significant metabolic, hematological, pulmonary, including latent tuberculosis, cardiovascular, gastrointestinal including cholecystectomy, neurologic, hepatic, renal, urological, or psychiatric disorders.
2. Participants who have any history or suspicion of kidney stones.
3. Participants who have used prescription drugs, over-the-counter drugs, or herbal remedies within 14 days before Day 1 of study medication dosing. Females who have received hormone replacement therapy (HRT) within 28 days prior to dosing.
4. Women who are pregnant or breastfeeding.