Fascinating. So it seems to have been used for parasitic and fungal skin treatments, angina, and to induce miscarriage. With no doubt a very narrow band of error.
You remind me of Episode 2 of the Apothecary Diaries: several Chinese troops were poisoned after eating local food. The food was fine, the wood used for fire and eating utensils was the source. I wonder if something like that ever actually happened?