LD-2020

Primary objectives: (1) To evaluate the safety and tolerability of LD2020 Enteric-coated Tablets after single oral dose escalation in healthy Chinese adult volunteers. (2) To evaluate the safety and tolerability of LD2020 Enteric-coated Tablets after multiple oral doses in healthy Chinese adult volunteers. Secondary objectives: (1) To evaluate the pharmacokinetic (PK) characteristics of LD2020 Enteric-coated Tablets after single and multiple oral doses in healthy Chinese adult volunteers; to conduct a preliminary exploration of the material balance of LD2020 in humans. (2) To evaluate the effect of food (high-fat, high-calorie meal) on the PK of LD2020 Enteric-coated Tablets. (3) To preliminarily evaluate the effect of LD2020 Enteric-coated Tablets on the QT/QTc interval of volunteers.