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 months prior to the first dose or whose surgical incision has not fully healed. * Used investigational drugs or received other experimental treatments within three months prior to the first dose or are currently participating in any other interventional clinical trials. * Vaccinated within one month prior to the first dose or plan to be vaccinated during the trial period. * Used any drugs affecting drug-metabolizing enzymes or transporters within 30 days prior to the first dose. * Taken any prescription drugs, over-the-counter medications, herbal medicines, or dietary supplements within 14 days prior to the first dose. * Smoke more than 10 cigarettes per day or habitually use nicotine-containing products within three months prior to the first dose. * Current or previous alcohol abuse, or frequent alcohol consumption within six months prior to the first dose, or those with a positive alcohol breath test. * History of drug abuse, use of soft drugs within three months prior to the first dose, or use of hard drugs within one year prior to the first dose, or those with a positive urine drug abuse screening. * Individuals who habitually or excessively consume grapefruit juice, tea, coffee, and/or caffeinated beverages. * History of blood loss or blood donation (≥400 mL) within three months prior to the first dose, those who have received blood transfusions or blood products within one month prior to the first dose, or those who plan to donate blood within three months after the trial. * Special dietary requirements, intolerance to high-fat meals, or inability to comply with a standardized diet. * History of needle or blood phobia, difficulty with blood collection, or intolerance to venipuncture. * Pregnant or lactating women. * have poor compliance or other factors that make them unsuitable for participation in this trial.