1,4-Dioxino[2,3-g]quinoline-8-carboxylic acid, 10-chloro-3-(ethoxymethyl)-2,3,6,9-tetrahydro-9-oxo-, ethyl ester 54340-59-9 DU-23187 Ethyl 10-chloro-3-(ethoxymethyl)-2,3,6,9-tetrahydro-9-oxo-p-dioxino[2,3-g]quinoline-8-carboxylate NSC287475 Quincarbate