A Study to Evaluate the Food Effect on RNK08954 in Healthy Participants, and the Mass Balance Study of [14C]RNK08954 in Healthy Adult Male Subjects

Inclusion Criteria: * Healthy, adult, male or female, 18-45 years of age, inclusive, at the screening visit. * Male participants must have a body weight of no less than 50 kg, and female participants must have a body weight of no less than 45 kg. The Body mass index (BMI) should be between 19 and 26 kg/m² (inclusive). * Must follow protocol specified contraception guidance. * Understands the study procedures in the informed consent form (ICF), and be willing and able to comply with the protocol. Exclusion Criteria: * Clinically significant abnormalities found in comprehensive physical examinations, vital signs, laboratory tests, 12-lead electrocardiogram, chest X-ray, etc. * Positive results for hepatitis B surface antigen (HBsAg), hepatitis C virus antibody (HCV-Ab), human immunodeficiency virus antibody (HIV-Ab), or treponema pallidum antibody. * Individuals with allergic constitution. * Any history of clinically significant diseases or conditions that, in the investigator's judgment, may affect the trial results. * History or family history of organic heart disease, heart failure, myocardial infarction, angina pectoris, torsades de pointes, ventricular tachycardia, QT prolongation syndrome. * Gastrointestinal diseases that cause clinically significant symptoms such as nausea, vomiting, diarrhea, or malabsorption syndrome, or those with a history of vomiting or diarrhea within one week prior to screening. * Individuals with dysphagia. * Undergone major surgery within six…