2-Benzofurancarboxylic acid, 4-(hydroperoxyacetyl)-3-methyl-, ethyl ester 2-Benzofurancarboxylic acid, 5-(carboxymethoxy)-3-methyl-, 2-ethyl ester 4-(2-Carbethoxy-3-methylbenzofuryl)-oxyacetic acid 4-(Hydroperoxyacetyl)-3-methyl-2-benzofurancarboxylic acid ethyl ester 82039-83-6