LDS

Primary objectives: (1) To evaluate the safety and tolerability of single-ascending oral administration of LDS tablets in healthy Chinese subjects. (2) To evaluate the safety and tolerability of multiple oral administration of LDS tablets in healthy Chinese subjects. Secondary objectives: (1) To evaluate the pharmacokinetic (PK) characteristics of LDS tablets after single-ascending oral administration in healthy Chinese subjects; at the same time, feces and urine were collected to determine the concentration of LDS or metabolites (if necessary) to conduct a preliminary exploration of LDS metabolism and excretion in humans. (2) To evaluate the effect of food (high-fat and high-calorie meals) on the PK of LDS tablets. (3) To evaluate the PK characteristics of LDS tablets after multiple oral administration in healthy Chinese subjects.