The Safety, Tolerability and Pharmacokinetic Study of HEC585 in Healthy Male and Female Subjects

Inclusion Criteria: 1. Males or females, of any race, between 18 and 60 years of age, inclusive, at Screening. 2. Body mass index between 18.0 and 32.0 kg/m2, inclusive, at Screening. 3. In good health, determined by no clinically significant findings from medical history, physical examination, 12-lead ECG, vital sign measurements, and clinical laboratory evaluations (congenital nonhemolytic hyperbilirubinemia \[eg, Gilbert's syndrome\] is not acceptable) at Screening and/or Check-in as assessed by the Investigator (or designee). 4. Females will be nonpregnant and nonlactating. Females of childbearing potential and male subjects will agree to use contraception. 5. Able to comprehend and willing to sign an informed consent form (ICF) and to abide by the study restrictions. Exclusion Criteria: 1. Significant history or clinical manifestation of any metabolic, allergic, dermatological, hepatic, renal, hematological, pulmonary, cardiovascular, gastrointestinal, neurological, respiratory, endocrine, or psychiatric disorder, as determined by the Investigator (or designee). 2. History of significant hypersensitivity, intolerance, or allergy to any drug compound, food, or other substance, unless approved by the Investigator (or designee). 3. History of stomach or intestinal surgery or resection that would potentially alter absorption and/or excretion of orally administered drugs (uncomplicated appendectomy and hernia repair will be allowed). 4. History of alcoholism or drug/chemical abuse within 2 years prior to Check-in. 5. Alcohol consumption of \> 21 units per week for males and \> 14 units for females. One unit of alcohol equals 12 oz (360 mL) beer, 1½ oz (45 mL) liquor, or 5 oz (150 mL wine), or a positive alcohol breath test at Check-in. 6. Positive urine drugs of abuse screen including cotinine at Screening or Check-in. 7. Positive hepatitis B surface antigen, hepatitis C virus antibody and/or positive human immunodeficiency virus (HIV) test (Appendix 3). 8. Absolute lymphocyte count below the lower limit of normal which can be confirmed by repeat. 9. Participation in a clinical study involving administration of an investigational drug (new chemical entity) in the past 30 days or 5 half-lives (if known), whichever is longer, prior to Check-in. 10. Use or intend to use any medications/products known to alter drug absorption, metabolism, or elimination processes, including St. John's Wort, within 30 days prior to Check-in, unless deemed acceptable by the Investigator (or designee). Strong CYP3A inhibitors and inducers should be avoided. 11. Use or intend to use any prescription medications/products, within 14 days prior to Check-in, unless deemed acceptable by the Investigator (or designee). 12. Use or intend to use any nonprescription medications/products including vitamins, minerals, and phytotherapeutic/herbal/plant-derived preparations within 7 days prior to Check-in, unless deemed acceptable by the Investigator (or designee). 13. Use of tobacco- or nicotine-containing products within 3 months prior to Check-in. 14. Consumption of foods and beverages containing poppy seeds, grapefruit, or Seville oranges within 7 days prior to Check-in, consumption of caffeine-containing foods and beverages within 72 hours prior to Check-in, or consumption of alcohol within 48 hours prior to Check-in. 15. Receipt of blood products within 2 months prior to Check-in. 16. Donation of blood from 56 days prior to Screening, plasma from 2 weeks prior to Screening, or platelets from 6 weeks prior to Screening. 17. Poor peripheral venous access. 18. Have previously completed or withdrawn from this study, and have previously received the investigational product. 19. Subjects who, in the opinion of the Investigator (or designee), should not participate in this study.