“A team of researchers led by Professor Hiroaki Kitagishi from Doshisha University in Japan has developed a synthetic heme-model compound called “hemoCD-Twins” that acts as an antidote for CO and HCN poisoning. The researchers detail the development of this novel antidote in a recent research article published in the Proceedings of the National Academy of Sciences.”

Antidote Against Fire Gas Poisoning: Overcomes Simultaneous Carbon Monoxide and Hydrogen Cyanide Poisoning (scitechdaily.com)