Nasty stuff. Burning refrigerant creates that. Soldering/brazing old AC/refrigeration lines. Need to purge that stuff.
Illegal to develop as a weapon (weaponize).
International law forbids it.
Part of that agreement we’ve been seeing regarding the BioLabs in UKR.
We (as an industrial concern in the US) must account for every molecule of Phosgene we handle on site (mostly byproduct).
Annual ChemWeapons report.
The refined version has that smell; your version has carries that burnt bitternes.