Inclusion Criteria:
1. Voluntarily sign the informed consent form prior to the study, fully understand the study content, procedures, and possible adverse events, and self-report the ability to complete the study in accordance with the protocol;
2. Adult male and female participants (aged ≥18 years, calculated on the day of signing the informed consent form);
3. Agree to pratice highly effective contraception from the signing of the informed consent form until 6 months after the last dose of HS-10504 and have no plans for reproduction or sperm/egg donation during this period.
Exclusion Criteria:
1. Subjects with clinically significant abnormalities in physical examination, vital signs, 12-lead ECG, chest X-ray (posteroanterior and lateral views), clinical laboratory tests, etc., during the screening period, which are deemed unsuitable for enrollment by the investigator.
2. Subjects with a history of severe diseases of the nervous, psychiatric, digestive, circulatory, respiratory, or urinary systems, or currently having such diseases, or newly diagnosed diseases before administration of the investigational product, which are assessed by the investigator as unsuitable for participation in this trial.
3. Subjects who have had surgery within 3 months prior to screening, or have planned surgery during the trial, or have undergone surgery that may affect drug absorption, distribution, metabolism, or excretion, and are deemed unsuitable for enrollment by the investigator.
4. Subjects who have participated in any other clinical trial and received any investigational drug/device within 3 months prior to screening.
5. Subjects with a history of severe allergies, or allergic constitution, or known allergy to any component of the investigational product, or a history of hypersensitivity to drugs with chemical structures similar to HS-10504 or belonging to the same class as HS-10504.
6. Subjects with a history of drug abuse, drug dependence, or illicit drug use within 5 years prior to screening, or those with a positive result in drug abuse screening.
7. Subjects who are habitual drinkers within 3 months prior to screening, or those who cannot abstain from alcohol during the trial, or those with a positive breath alcohol test during screening.
8. Subjects who have smoked an average of more than 5 cigarettes per day within 3 months prior to screening, or those who cannot refrain from using any tobacco products during the trial.
9. Subjects who have consumed excessive amounts of tea, coffee, or caffeinated beverages within 3 months prior to screening.
10. Subjects who have had significant blood loss (≥400 mL) or donated blood within 3 months prior to screening, or donated blood or lost blood ≥200 mL within 1 month, or those who plan to donate blood during the trial.
11. Subjects who have used any prescription drugs, over-the-counter drugs, herbal medicines, or health supplements (excluding topical agents with local effects) within 30 days prior to the first dose of the investigational product, or who have used any drug within a period less than 7 half-lives (whichever is longer) before dosing.
12. Subjects who are lactating within 1 month prior to screening or during the trial, or female participants with a positive pregnancy test, or those who have had unprotected sexual intercourse within 14 days prior to screening.
13. Subjects with special dietary requirements, unable to comply with the unified diet, or with dysphagia.
14. Subjects who cannot tolerate venipuncture or indwelling needle blood sampling, or have a history of needle phobia or blood phobia.
15. Subjects who may be unable to complete the trial for other reasons or are deemed unsuitable for participation by the investigator.
