1,3,4-oxadiazol-2(3H)-one, 5-(4-methoxyphenyl)- 5-(4-methoxyphenyl)-1,3,4-oxadiazol-2(3H)-one InChI=1/C9H8N2O3/c1-13-7-4-2-6(3-5-7)8-10-11-9(12)14-8/h2-5H,1H3,(H,11,12