4b,9b-Dihydro-4b,9b-diphenylbenzofuro(3,2-b)benzofuran-2,7-diol diacetate Benzofuro(3,2-b)benzofuran-2,7-diol, 4b,9b-dihydro-4b,9b-diphenyl-, diacetate DF8075600