A Phase I Clinical Study of SSD8432 in Healthy Adult Subjects

"Cohort 1 Period 1 single dose of SSD8432 dose 1 or placebo, on day 1. Period 2: single dose of SSD8432 dose 2 or placebo , on day 7. Period 3: single dose of SSD8432 dose 3 on day 13, ritonavir or placebo, before SSD8432 dose 3 and BID on SSD8432 dosing date~Cohort 2:~Period 1 single dose of SSD8432 dose 4 or placebo, on day 1 Period 2: single doses of SSD8432 dose 5 or placebo , on day 7 Period 3: single dose of SSD8432 dose 6 on day 13, ritonavir or placebo, before SSD8432 dose 3 and BID on SSD8432 dosing date~Cohort 3:~single dose of SSD8432 dose 7 or placebo on day1. ritonavir or placebo, before SSD8432 dose 7 and BID on SSD8432 dosing date."

Cohort 4: SSD8432 dose 8 or placebo, on day 1 \~day6. Cohort 5: SSD8432 dose 9 or placebo, on day 1 \~day6.

Cohort 6: SSD8432 dose 10 or placebo, on day 1 \~day6. Cohort 7: SSD8432 dose 11 or placebo, on day 1 \~day6. Cohort 8: SSD8432 dose 12 or placebo, on day 1 \~day6 Cohort 9: to be decided

"Cohort 10:~Group A: SSD8432 dose 13, on day1 under fasting condition, on day 6 under fatty food condition, ritonavir, before SSD8432 dose 13 and BID on SSD8432 dosing date.~Group B: SSD8432 dose 13, on day1 fatty food condition, on day 6 under fasting condition ,Ritonavir, before SSD8432 dose 13 and BID on SSD8432 dosing date"

Cohort 11: to be decided