A Drug-drug Interaction (DDI) Study of Morphothiadine Mesilate/Ritonavir in Healthy Subjects

Inclusion Criteria: * Sign the informed consent form before the trial and fully understand the contents of the trial, the process and possible adverse reactions * Be able to complete the study according to the trail protocol * Subjects (including partners) have no pregnancy plan within 1 year after the last dose of study drug and voluntarily take effective contraceptive measures * Male subjects and must be 18 to 45 years of age inclusive * Body weight ≥ 50 kg and body mass index（BMI）between 18 and 28 kg / m2, inclusive * Physical examination and vital signs without clinically significant abnormalities. Exclusion Criteria: * Use of \>5 cigarettes per day during the past 3 months * Known history of allergy to study drugs，or allergies constitution ( multiple drug and food allergies) * History of alcohol abuse (14 units of alcohol per week: 1 unit = 285 mL of beer, or 25 mL of spirits or 100 mL of wine) * Donation or loss of blood over 450 mL within 3 months prior to screening * 12-lead ECG with clinically significant * Positive for Viral hepatitis (including hepatitis B and C), HIV and syphilis * Subjects deemed unsuitable by the investigator for any other reason.