2-BENZOFURANCARBOXYLIC ACID 2-Carboxybenzofuran 496-41-3 5-18-06-00419 (Beilstein Handbook Reference) AI3-03711 BRN 0124204 Benzo(b)furan-2-carboxylic acid Coumarilic acid Coumarone-2-carboxylic acid EINECS 207-818-9 NSC 6165