Evaluation of Safety, Tolerability, Pharmacokinetics and Pharmacodynamics of BT-114143 Injection in Healthy Subjects

6 subjects will receive a single dose of BT-114143 injection at 0.03 mg/kg.

6 subjects will receive a single dose of BT-114143 injection at 0.07 mg/kg.

3 subjects will receive a single dose of BT-114143 injection at 0.15 mg/kg.

6 subjects will receive a single dose of BT-114143 injection at 0.3 mg/kg.

6 subjects will receive a single dose of BT-114143 injection at 0.6 mg/kg.

6 subjects will receive a single dose of BT-114143 injection at 1.2 mg/kg.

6 subjects will receive a single dose of BT-114143 injection at 2.4 mg/kg.

6 subjects will receive a single dose of BT-114143 injection at 4.8 mg/kg.

6 subjects will receive a single dose of BT-114143 injection at 8.4 mg/kg.

6 subjects will receive a single dose of BT-114143 injection at 12.6 mg/kg.

6 subjects will receive a single dose of BT-114143 injection at 15 mg/kg.

Except that the S1 dose group was a pilot study group with 1 subject matched to receive a placebo, all other dose groups were each matched with 2 subjects who received placebo treatment as controls.