.alpha.-Cyano-3,4-dihydro-1(2H)-quinoxalineacrylic acid ethyl ester 1(2H)-Quinoxalineacrylic acid, 3,4-dihydro-.alpha.-cyano-, ethyl ester 2-Propenoic acid, 2-cyano-3-(3,4-dihydro-1(2H)-quinoxalinyl)-, ethyl ester 6687-89-4 NSC90843