JKN2306

To evaluate the safety and tolerability of a single oral administration of JKN2306 tablets in healthy subjects. Secondary objectives: To evaluate the pharmacokinetic (PK) characteristics of a single oral administration of JKN2306 tablets in healthy subjects; to evaluate the effect of a high-fat diet on the PK characteristics of a single oral administration of JKN2306 tablets in healthy subjects. Exploratory objectives: To explore the C-QTc relationship after a single oral administration of JKN2306 tablets in healthy subjects; to explore the metabolites in the blood after a single oral administration of JKN2306 tablets in healthy subjects.