Abstract
[gamma] -Ethylideneglutamic acid has been isolated from fruit capsules of tulip plants. The assigned structure was indicated by examining the products formed after oxidation and catalytic hydrogenation and was confirmed by nuclear-magnetic-resonance spectroscopy and by synthesis of [gamma]-ethylglutamic acid. The ability of [gamma]-ethylideneglutamic acid to participate in transamination and decarboxylation reactions was examined.