The movie was "Medicine Man" starring Sean Connery, made in 1992.


http://www.imdb.com/title/tt0104839/

 

"An eccentric scientist working for a large drug company is working on a research project in the Amazon jungle. He sends for a research assistant and a gas chromatograph because he's close to a cure for cancer. When the assistant turns out to be a "mere woman," he rejects her help. Meanwhile the bulldozers get closer to the area in which they are conducting research, and they eventually learn...


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