PA3670

Phase I and Phase II: Single-dose, ascending dose (SAD), and multiple-dose studies Primary objective: To evaluate the safety and tolerability of single and multiple oral administration of PA3670 tablets in healthy Chinese adult subjects. Secondary objective: To evaluate the pharmacokinetic characteristics of single and multiple oral administration of PA3670 tablets in healthy Chinese adult subjects. Phase III: Study on the effect of food on pharmacokinetics Primary objective: To evaluate the effect of food on the pharmacokinetics of oral PA3670 tablets in healthy Chinese adult subjects. Secondary objective: To evaluate the safety of single oral administration of PA3670 tablets in healthy Chinese adult subjects.