30095-79-5 4H-1-Benzopyran-2-carboxylic acid, 6-nitro-4-oxo-, ethyl ester 5-18-08-00319 (Beilstein Handbook Reference) BRN 1292011 EINECS 250-047-8 Ethyl 6-nitro-4-oxo-4H-1-benzopyran-2-carboxylate