Isn’t that the stuff that can potentially turn you blue?
‘Yeah, take this for your syphilis, you might turn blue. Don’t take it and you might DIE’.
Tough choice there if you’ve got a resistant strain.
Money might be had in figuring out how to prevent or reverse the blue though.
Are you talking about syphilis or Salversan? (snicker) Salversan can turn the skin blue. Ironic we used to use a variant of Salversan to treat dogs for heartworms. It was a combination of arsenic derivatives.