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Patent Pending Sirolimus (also known as rapamycin) is a chemical that was discovered by Suren Sehgal,[1] as a product of bacteria discovered on Easter Island (the island is also known as Rapa Nui).[2] It was approved by the US Food and Drug Administration in September 1999 and is marketed under the trade name Rapamune by Pfizer (formerly by Wyeth).