InChI=1/C18H16O2Si/c1-5-21(6-2,17-11-7-15(19-3)8-12-17)18-13-9-16(20-4)10-14-18/h1-2,7-14H,3-4H diethynyl[bis(4-methoxyphenyl)]silane silane, diethynylbis(4-methoxyphenyl)-