QD202

The main purpose of the study is to evaluate the safety and tolerability of single and multiple intravenous infusions of QD202 for injection in healthy adult subjects. The secondary objectives of the study are: 1) to evaluate the pharmacokinetic (PK) characteristics of QD202 for injection after single and multiple intravenous infusions in healthy adult subjects; 2) to evaluate the effect of QD202 for injection on the QT/QTcF interval after a single intravenous infusion in healthy adult subjects.