This clinic trial evaluates the safety and tolerability of single- and multiple- ascending doses of WS016 in healthy adult participants. There will be about 64 participants,48 active and 16 placebo.

Inclusion Criteria:

1. The participants are fully informed of the purpose, methods and possible adverse reactions of the trial, and volunteer to serve as participants. And participants sign the informed consent form before any research procedures begin;
2. Participants are healthy male or female volunteers between the ages of 18 and 45 (including the cut-off values);
3. The weight of male participants is ≥50 kg, and the weight of female participants is ≥45 kg with a body mass index (BMI) of 19.0~26.0 kg/m^2 (including boundary values, BMI=weight (kg)/height^2 (m^2));
4. The participants understand and comply with the study procedures, can communicate well with the researchers, volunteer to participate in the trial, and sign the informed consent form.

Exclusion Criteria:

1. Participants with a specific allergy history (asthma, urticaria, eczema, etc.) or allergic constitution (e.g., known allergies to two or more substances), or known prior allergy to WS016 and related excipients;
2. Participants with chronic diseases or severe diseases in the liver, kidney, digestive system, endocrine system, cardiovascular system, nervous system, metabolic system, blood system, respiratory system, and autoimmune system, or current diseases in these systems as judged by investigators to be unsuitable for inclusion;
3. Participants who have undergone surgery within 3 months prior to screening, or plan to undergo surgery during the study period, as well as subjects who have undergone surgery that affects drug absorption, distribution, metabolism, and excretion;
4. Participants with dysphagia or gastrointestinal diseases/symptoms judged by investigators to affect drug absorption;
5. Participants who have received blood transfusions or used blood products ≥400 mL or 2 units within 3 months prior to screening, or have lost ≥400 mL of blood within 6 months, or have donated blood within 3 months;
6. Participants who have used any prescription drugs (including vaccines), over-the-counter drugs within 4 weeks prior to screening;
7. Pregnant or breastfeeding women, or participants with positive pregnancy test results before screening; male participants (or their partners) or female participants who have plans for pregnancy, sperm donation plans, or egg donation plans from the time they sign the informed consent form until 6 months after dosing; participants who are unwilling to use a medically recognized non-drug contraceptive method (e.g., intrauterine device or condom) during the study period;
8. Participants with abnormal findings in physical examination, vital signs examination, electrocardiogram, laboratory tests (including blood routine, urine routine, blood biochemistry, coagulation function), abdominal B-mode ultrasound examination, chest X-ray examination as judged by investigators to be clinically significant;
9. Participants with positive results for hepatitis B surface antigen (HBsAg), hepatitis C virus (HCV) quantitative test, human immunodeficiency virus (HIV) quantitative test, and syphilis antibody test;
10. Participants with a history of drug abuse within 12 months before screening, or urine drug screening positive results;
11. Participants with positive results in alcohol breath testing, or participants who consume alcohol regularly within 3 months before screening (defined as an average of more than 14 units of alcohol per week, and 1 unit is approximately equal to 200 mL of beer with a 5% alcohol content, or 25 mL of strong liquor with a 40% alcohol content, or 85 mL of wine with a 12% alcohol content), or participants who cannot abstain from alcohol during the study period;
12. Participants who are considered unsuitable for participation in this study by investigators.