What chemical causes death in many eukaryotes because it blocks Cytochrome c oxidase?

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Cyanide is a highly toxic chemical that blocks the activity of Cytochrome c oxidase, an enzyme involved in the electron transport chain, leading to the inhibition of cellular respiration and ultimately causing death in many eukaryotes. Copper and iron are essential elements required for many biological processes, and oxygen is necessary for aerobic respiration, while carbon monoxide binds to hemoglobin, reducing its oxygen-carrying capacity. However, none of these chemicals directly block Cytochrome c oxidase.

What Chemical Causes Death in Many Eukaryotes Because It Blocks