It was Eva Saxl. She had fled the Nazis from Czechoslovakia only to find herself under Japanese occupation in Shanghai. From the Wikipedia article, it seems like she extracted the insulin from water buffalo pancreas. I’m not sure if that counts as homebrewing. When I think of homebrew insulin, I think of actually manufacturing it by fermenting specialized yeast as opposed to harvesting it from animals. I don’t think there’s anything wrong with that, but it isn’t really the same.