Phase 2 Study to Evaluate the Efficacy, Safety and PK of Intravenous Single Injection LC28-0126 Immediately Before PCI in STEMI Patients

Inclusion Criteria: * Age between 20 and 75 * Within 12 hours after the onset of chest pain * ST-segment elevation of more than 0.1 mV in two contiguous leads or new LBBB(left bundle-branch block) patients * Signed for written informed consent Exclusion Criteria: * Left Main disease * Multi-vessel disease