Penicillin is a type of antibiotic that is produced by mold. It was discovered in the 20th century by Alexander Fleming.
Alexander Fleming
Fungi named Penicilium notatum
There are many other antibiotics.
Penicillin is a class of compounds with one atom of sulphur in the common part of each molecule. Please see the wikipedia article for more information.
Alexander Flemming stumbled onto it accidentally in Indonesia and noted it, then an Australian Howard Florey and Ernst Chain developed it to a point where it became a useful material its mass production was then developed by the US defense department in preparation for the treatment of casualty expected in the Korean war.Alexander Flemming
The bibliography of penicillin includes scientific papers by Alexander Fleming (1929, 1945), Howard Florey, Ernst Boris Chain, and their collaborators. These papers describe the discovery, purification, and early experiments demonstrating the antibiotic properties of penicillin. Additionally, there are numerous textbooks, reviews, and historical accounts that discuss the development and impact of penicillin in medicine.