4-18-00-06340 (Beilstein Handbook Reference) 4H-1-Benzopyran-2-carboxylic acid, 4-oxo-7-(phenylmethoxy)-, ethyl ester 6345-73-9 BRN 0306136 Ethyl 4-oxo-7-(phenylmethoxy)-4H-1-benzopyran-2-carboxylate