9,10-diethyl-2,3,6,7-tetramethoxyanthracene InChI=1/C22H26O4/c1-7-13-15-9-19(23-3)21(25-5)11-17(15)14(8-2)18-12-22(26-6)20(24-4)10-16(13)18/h9-12H,7-8H2,1-6H anthracene, 9,10-diethyl-2,3,6,7-tetramethoxy-