<human>:  Who discovered the drug rapamycin?
<bot>: Rapamycin was discovered by Paul Ehrlich in the 1960s. He found it in the bacterium Streptomyces hygroscopicus, which was originally found in soil in Easter Island. Rapamycin was originally used as an antifungal agent, but it was later discovered to have other uses, including anti-inflammatory and immunosuppressive effects.