A former Food and Drug Administration chemist was sentenced Monday to five years in prison and three years of supervised release for his involvement in a $3.7 million insider trading scheme, officials said.

Cheng Yi Liang, 58, of Gaithersburg, was sentenced in federal court in Greenbelt on charges of securities fraud and making false statements. He pleaded guilty to those charges in October, according to the Maryland U.S. Attorney’s Office.