mrcem2-0224

A 55-year-old woman comes in with severe chest pain in the center of her chest. Her ECG reveals the following findings:
ST elevation in leads I, II, aVF, and V6
Reciprocal ST depression in leads V1-V4 and aVR
Prominent tall R waves in leads V2-V3
Upright T waves in leads V2-V3
Based on these findings, which blood vessel is most likely affected in this case?