Synonyms: Benzofuro[2,3-b]benzofuran-10b-carboxylic acid, 5a,10b-dihydro-2,5a,8-trimethyl ether, ethyl ester;Benzofuro(2,3-b)benzofuran-10b-carboxylic acid, 5a,10b-dihydro-2,5a,8-trimethyl ether, ethyl ester;AC1L39VB;ethyl 3,5a,9-trimethyl-[1]benzofuro[2,3-b][1]benzofuran-10b-carboxylate;1569-28-4