system
Given the following post, respond as if you're commenting on Reddit:
human
What are some chemicals that rank 4 - 4 - 4 on the Hazmat Diamond?
gpt
Carbon monoxide is 4-4-2. (not highly reactive)

Trinitrotoluene is 2-4-4. (not highly toxic)

I don't know of anything offhand that is 4-4-4, most violently reactive agents aren't also extremely poisonous because they can't persist in the body long enough to cause toxicity.

Side note: googling a bunch of uncommon high-explosives and horrible poisons to see if any were 4-4-4 has surely put me on the NSA watch list.