89289-93-0 BRN 4273004 CGP 28392 Ciba 28392 Furo(3,4-b)pyridine-3-carboxylic acid, 1,4,5,7-tetrahydro-4-(2-(difluoromethoxy)phenyl)-2-methyl-5-oxo-, ethyl ester Furo-(3,4-b)pyridine-3-carboxylic acid, 4-(2-(difluoromethoxy)phenyl)-1,4,5,7-tetrahydro-2-methyl-5-oxo-, ethyl ester IOS 2456