1,1':3',1''-terphenyl, 5'-ethynyl-4'-methoxy- 5'-ethynyl-1,1':3',1''-terphenyl-4'-yl methyl ether InChI=1/C21H16O/c1-3-16-14-19(17-10-6-4-7-11-17)15-20(21(16)22-2)18-12-8-5-9-13-18/h1,4-15H,2H