145594-61-2 1H,3H-Difuro(3,4-b:3',4'-e)pyridine-1,7(4H)-dione, 5,8-dihydro-8-(4-methoxyphenyl)- 5,8-Dihydro-8-(4-methoxyphenyl)-1H,3H-difuro(3,4-b:3',4'-e)pyridine-1,7(4H)-dione