NKH0209

Primary purpose: To evaluate the safety and tolerability of single/multiple oral administration of different doses of BTP0209 tablets on an empty stomach in healthy subjects. Secondary purpose: To evaluate the pharmacokinetic characteristics of single/multiple oral administration of different doses of BTP0209 tablets on an empty stomach in healthy subjects and to investigate the effect of food on the pharmacokinetic characteristics of single oral administration of BTP0209 tablets in healthy subjects.