This is a single center,double-blind,randomized,parallel design, single and multiple dose trial to evaluate the pharmacokinetics(PK), safety and tolerability of ZSP1273,and the effect of food on ZSP1273 Pharmacokinetics.

The study will be divided in 3 parts :

Study Part I(Single Ascending Dosing, SAD) will be a single ascending dose to be run at a maximum of 6 dose levels. Subjects included in this part of the study will receive only one dose level to limit the exposure to ZSP1273. Four subjects are planned to be included in the first group while 10 subjects are enrolled in every following cohort.

Study Part II(Multiple Ascending Dosing, MAD) will start after completion of some Cohorts of Study Part I. Study Part II will be a multiple ascending dose to be run at a maximum of 3 dose levels. Subjects included in this part of the study will receive only one dose level. This part also enrolls 10 subjects in every cohort.

Study Part III(Food Effect study, FE) will consists of 2 periods,and subjects will receive a single dose ranged from 100-600mg on fasting and postprandial states respectively. There will be a 7-day wash out period between treatment periods.A total of 12 to 18 subjects will be included.

All the 3 parts will be run in healthy subjects.

Inclusion Criteria:

Subjects are required to meet the following criteria in order to be included in the trial:

1. Signature of a dated Informed Consent Form (ICF) indicating that the subject has been informed of all the relevant aspects(including adverse events) of the trial prior to enrollment.
2. Subjects must be willing and able to adhere to the visit schedule and protocol requirements and be available to complete the study.
3. Subjects (including partners) must use reliable methods of contraception during the study and until 6 months following the last dose of investigational product.
4. Males and female subjects between 18-50 years (Both inclusive).
5. Body weight is no less than 50 kg in males and no less than 45 kg in females. Body mass index (BMI) 18≤BMI≤28 kg/m2; BMI is determined by the following equation: BMI = weight/height2 (kg/m2).
6. Physical condition and vital signs: Normal or abnormality has no clinical significance.

Exclusion Criteria:

Eligible subjects must not meet any of the following exclusion criteria:

1. Known hypersensitivity and/or allergy to some drugs and food, especially for the composition that is similar to the investigative product;
2. The average daily smoking are more than 5 cigarettes within 3 months prior to screening.
3. Known history of drug or alcohol abuse.(defined as consumption of 14 units of alcohol per week: 1 unit = 285 ml of beer; or the equivalent of 25 ml of spirit, or 100 ml of wine )
4. Subjects who donated blood or bleeding profusely (> 400 mL) in the 3 months preceding study screening.
5. Dysphagia or any medical history in gastrointestinal that interferes with the absorption of drugs, include a history of frequent nausea or vomit causes by any etiology.
6. History or presence of any disease or condition known to increase the risk of bleeding , eg. acute gastritis, duodenal ulcer, etc.
7. Participant with any history of clinically significant skin disease such as, but not limited to, dermatitis, eczema, drug rash, psoriasis, or urticaria.
8. Subjects with recent significant change in diet or exercise.
9. Participated in another clinical research study and received any investigational products within 3 months prior to dosing.
10. Concomitant therapy with any drugs with known hepatic enzyme-inducing or inhibiting agents prior to screening or during the study, including strong inhibitory agents and inducers that affect metabolic enzymes (see appendix 6 for specific drug information).
11. Use of any prescription or over-the-counter (OTC) medications, vitamins and herbal or dietary supplements within 14 days prior to screening.
12. History of having any special food (including dragon fruit, mango, grapefruit, etc.), strenuous exercises, or other factors may interfere with the absorption, distribution, metabolism, or excretion of drug within 14 days prior to screening.
13. Inability to consume the food provided in the study ( a high fat, high calorie meal includes two eggs , a piece of butter bacon toast, a box of fried potatoes, and a glass of whole milk).This requirement only applies to subjects under fed condition.
14. Presence of clinically significant abnormalities in ECG or QTcB>470ms in males, or QTcB>480ms in females.
15. Pregnancy or breastfeeding at screening and during the study. All female subjects of childbearing potential must have a negative urine pregnancy test at screening and during the trial.
16. Any clinically significant abnormality upon physical examination or presence of a clinically significant gastrointestinal, renal, hepatic, neurologic, hematic, endocrine, neoplastic, pulmonary, immune, psychiatric or cardiovascular and cerebrovascular disorder(s)(but not limited to above disorders) in the 6 months preceding study screening.
17. Positive hepatitis B surface antigen, hepatitis C virus antibody,human immunodeficiency virus (HIV) or treponema pallidum antibodies at screening.
18. Any acute illness or concomitant medication from screening to first dosing.
19. Have chocolate, any food or beverage that contains caffeine or xanthine within 24 hours prior to dosing.
20. Positive for urine drug screening or history of substance and drug abuse for a period of 5 consecutive years before screening.
21. Subjects who may not complete the study for other reasons or should not be included in the study in the opinion of the investigator.

Masking for Participant, Investigator and Clinical Research Associate