1,3-Dioxolo(4,5-g)quinoline-7-carboxylic acid, 5-(difluoromethyl)-5,8-dihydro-8-oxo- 5-Fluoromethyl-5,8-dihydro-8-oxo-1,3-dioxolo(4,5g)quinolone-7-carboxylic acid 64621-47-2 EN 272 EN-272