Where did Tamiflu come from?

Tamiflu, or oseltamivir, was developed from a naturally occurring chemical found in the Japanese red algae species called Gelidium amansii. The drug was created in the 1990s by researchers at the pharmaceutical company Gilead Sciences, who modified the chemical structure to enhance its antiviral properties against influenza. It was later licensed to Roche, which brought it to market in 1999. Tamiflu is used to treat and prevent influenza A and B infections.