23796-66-9 6-Ethyl-9-oxo-2,3-dihydro-p-dioxino(2,3-g)quinoline-8-carboxylic acid BRN 1083712 p-DIOXINO(2,3-g)QUINOLINE-8-CARBOXYLIC ACID, 2,3-DIHYDRO-6-ETHYL-9-OXO-