A high school student from Westport has been named one of four students to represent the United States in the 42nd annual International Chemistry Olympiad.

Alexander Siegenfeld, who attends the Hopkins School in New Haven, will join three other students from across the nation at the international competition to be held July 19-28 in Tokyo, Japan, according to the American Chemical Society. ACS sponsors the American team with support from other partners.

Joining Siegenfeld on the team are: Richard Li of Clarksville, Md., who attends River Hill High School; Colin Lu of Vestal, N.Y., Vestal High School, and Utsarga Sikder of Monmouth Junction, N.J., South Brunswick High School. Alternates are: Joe Tung of Cerritos, Calif., Gretchen Whitney High School, and Kevin Yan of North Potomac, Md., Wootton High School.

The four members of the team and two alternates were chosen after a nine-day study and training camp for 20 of the nation's top chemistry students at the U.S. Air Force Academy in Colorado Springs, Col. They were selected from more than 11,000 high school students nationally who initially competed for a spot on the American team.