Randomized, double-blind and placebo-controled study to assess the safety, tolerability and pharmacokinetics of single ascending doses of ZX-7101A and its food effect in China healthy adult volunteers. The study is composed of 2 parts. Part 1 is to assess the safety, tolerability and pharmacokinetics of a single ascending doses of ZX-7101A tablet. Part 2 is to assess the food effect on ZX-7101A at a selected dose in a cross-over design.

Inclusion Criteria:

• Healthy adults age of 18-45 years old
• BMI in the range of 9~26 kg/m2; Bodyweight (male) ≥50kg, Bodyweight (Female) ≥45kg
• In the judgement of the investigator, no clinically relevant abnormalities identified by a detailed medical history and full physical examination including BP and pulse rate measurement, or clinical laboratory tests
• Female subjects of nonchildbearing potential must be not pregnant or lactating. Subjects must consent and comply with the contraception requirement of the study.
• Able to understand the risks involved in the study, and provide written informed consent before the first study-specific procedure
• Able to understand and comply with the study procedures

Exclusion Criteria:

• History of hypersensitivity or allergy to drug or food
• History of clinically significant abnormalities such as metabolic, liver, kidney, blood, lung, cardiovascular, gastrointestinal, urinary, endocrine, neurological, or psychiatric disorders; or in the judgement of the investigator, any medical abnormality that may be a concern to participate the study.
• Tympanic temperature >37.5℃, Pulse >100bmp or <50bmp, Systolic blood pressure ≥140mHg or ≤90mHg, or Diastolic blood pressure ≥90mHg or<50mHg
• Clinically relevant out-of-range baseline of total white cells or absolute neutrophil count
• Total bilirubin >1.5x ULN, AST >1.5 ULN or ALT >1.5ULN
• Estimated glomerular filtration rate (eGFR) <90 mL/min/1.73 m2
• QTc interval > 450ms （ Fridericia's correction ， QTcF=QT/(RR^0.33) ）, QRS>120ms
• Acute respiratory tract infection within 2 weeks
• Any condition possibly affecting drug absorption, e.g. gastrectomy
• Received treatment of any prescription drug or alternative medicine within 4 weeks before first dosing or any nonprescription drug within 2 weeks or 5x half-life, whichever is longer
• Regular alcohol consumption >14units/week I the past 6 months or positive in alcohol breath test
• Use of tobacco or nicotine containing products more than the equivalent of 5 cigarettes per day within 3 months
• Unwilling or unable to restrict the intake of caffeine or alcohol within 72 hours before dosing or during the in-patient observation period
• Use or intake of any known liver enzyme inducer or inhibitor within 14 days
• History of drug abuse or positive urine drug test
• Positive test for Hepatitis C antibody (HCV), Hepatitis B surface antigen (HbsAg), Human immunodeficiency virus (HIV) antibody, or Syphilis antibody at Screening
• Accumulative blood donation >400ml within 3 months or >200ml within 4 weeks or planning to donate during the study
• Pregnancy or lactating at screening
• Having difficulty of drawing blood from vein
• Treatment with an investigational drug or procedure within 3 months
• Received vaccination within 3 months or plan to be received vaccine during the study
• Received any surgical procedure within 3 months at screening
• Any other reason that, in the opinion of the investigator, unlikely to comply with the clinical study protocol or is unsuitable for any other reason.

double-blind, placebo-controled study