Question: As a consultant in a corner's lab, you have been asked to provide an explanation of a recent death. The body was found in a closed room with elevated levels of CO. Upon further investigation, the CSI team found a clear liquid in a drinking glass. After analysis with HPLC, it was discovered that the liquid contained a trace amount of cyanide. Which compound is the likely culprit of the person's death? How did the person die? Propose a likely structure of the culprit with cytochrome a3.