To evaluate the safety,tolerability and pharmacokinetics of single-multiple intravenous doses of FL058 in healthy Chinese subjects.

This study is divided into two parts: A and B.Part A discusses the safety and tolerability of IV FL058 single ascending dose (SAD) in two cohorts. Part B discusses the safety and tolerability of intravenous injection of FL058 in multiple dose (MAD) in three cohorts.

Inclusion Criteria:

1. Healthy adults aged between 18 and 45 years (inclusive).
2. Body mass index (BMI) ranges from 19 to 26 kg/m2 (inclusive), and the body weight is ≥50kg.
3. Good general health as determined by the Investigator based on medical history, physical examination, vital signs, 12-lead ECG and clinical laboratory tests.
4. Provide voluntary written informed consent prior to any study procedures and are willing and able to comply with the prescribed treatment protocol and evaluations.

Exclusion Criteria:

1. Concurrent or history of clinically significant cardiovascular, hepatic, renal, endocrine, gastrointestinal, respiratory, psychiatric, neurologic and/or hematological disorders.
2. Positive screen result for HBsAg, HCV-Ab, or HIV-Ab at screening.
3. History of clinically significant food or drug allergy.
4. A QT interval corrected using Fridericia's formula >450 msec.
5. eGFR<90mL/min/1.73m2.